155512440 has 128 divisors (see below), whose sum is σ = 521164800. Its totient is φ = 41247360.

The previous prime is 155512439. The next prime is 155512451. The reversal of 155512440 is 44215551.

155512440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 335649 + ... + 336111.

It is an arithmetic number, because the mean of its divisors is an integer number (4071600).

Almost surely, 2^155512440 is an apocalyptic number.

155512440 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 155512440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260582400).

155512440 is an abundant number, since it is smaller than the sum of its proper divisors (365652360).

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

155512440 is a wasteful number, since it uses less digits than its factorization.

155512440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 155512440 is about 12470.4627019209. The cubic root of 155512440 is about 537.7598556031.

Adding to 155512440 its reverse (44215551), we get a palindrome (199727991).

The spelling of 155512440 in words is "one hundred fifty-five million, five hundred twelve thousand, four hundred forty".