155609424 has 80 divisors (see below), whose sum is σ = 452272640. Its totient is φ = 51858144.

The previous prime is 155609407. The next prime is 155609497. The reversal of 155609424 is 424906551.

155609424 is a `hidden beast` number, since 1 + 5 + 5 + 609 + 42 + 4 = 666.

It is a super-2 number, since 2×155609424² = 48428585675223552, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32769 + ... + 37215.

It is an arithmetic number, because the mean of its divisors is an integer number (5653408).

Almost surely, 2^155609424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155609424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226136320).

155609424 is an abundant number, since it is smaller than the sum of its proper divisors (296663216).

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

155609424 is an frugal number, since it uses more digits than its factorization.

155609424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476 (or 4452 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 155609424 is about 12474.3506444223. The cubic root of 155609424 is about 537.8716221468.

The spelling of 155609424 in words is "one hundred fifty-five million, six hundred nine thousand, four hundred twenty-four".