155315440 has 80 divisors (see below), whose sum is σ = 420562368. Its totient is φ = 52236288.

The previous prime is 155315437. The next prime is 155315453. The reversal of 155315440 is 44513551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 155315399 and 155315408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27064 + ... + 32296.

Almost surely, 2^155315440 is an apocalyptic number.

155315440 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 155315440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210281184).

155315440 is an abundant number, since it is smaller than the sum of its proper divisors (265246928).

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

155315440 is a wasteful number, since it uses less digits than its factorization.

155315440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5306 (or 5300 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 155315440 is about 12462.5615344519. The cubic root of 155315440 is about 537.5326852307.

Adding to 155315440 its reverse (44513551), we get a palindrome (199828991).

The spelling of 155315440 in words is "one hundred fifty-five million, three hundred fifteen thousand, four hundred forty".