155434440 has 128 divisors (see below), whose sum is σ = 561024000. Its totient is φ = 33654528.

The previous prime is 155434427. The next prime is 155434441. The reversal of 155434440 is 44434551.

155434440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155434440² = 48319730276227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 155434398 and 155434407.

It is not an unprimeable number, because it can be changed into a prime (155434441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11091 + ... + 20829.

It is an arithmetic number, because the mean of its divisors is an integer number (4383000).

Almost surely, 2^155434440 is an apocalyptic number.

155434440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155434440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280512000).

155434440 is an abundant number, since it is smaller than the sum of its proper divisors (405589560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155434440 is a wasteful number, since it uses less digits than its factorization.

155434440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9779 (or 9775 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 155434440 is about 12467.3349197012. The cubic root of 155434440 is about 537.6699329288.

Adding to 155434440 its reverse (44434551), we get a palindrome (199868991).

The spelling of 155434440 in words is "one hundred fifty-five million, four hundred thirty-four thousand, four hundred forty".