155359440 has 120 divisors (see below), whose sum is σ = 532965888. Its totient is φ = 40538880.

The previous prime is 155359429. The next prime is 155359453. The reversal of 155359440 is 44953551.

155359440 is a `hidden beast` number, since 15 + 53 + 594 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×155359440² = 48273111194227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 155359395 and 155359404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31545 + ... + 36135.

Almost surely, 2^155359440 is an apocalyptic number.

155359440 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 155359440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266482944).

155359440 is an abundant number, since it is smaller than the sum of its proper divisors (377606448).

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

155359440 is a wasteful number, since it uses less digits than its factorization.

155359440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4657 (or 4648 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 155359440 is about 12464.3266966170. The cubic root of 155359440 is about 537.5834404444.

The spelling of 155359440 in words is "one hundred fifty-five million, three hundred fifty-nine thousand, four hundred forty".