155440032 has 48 divisors (see below), whose sum is σ = 445126752. Its totient is φ = 47102720.

The previous prime is 155440009. The next prime is 155440037. The reversal of 155440032 is 230044551.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×155440032² = 48323207096322048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 155439984 and 155440011.

It is not an unprimeable number, because it can be changed into a prime (155440037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72543 + ... + 74654.

It is an arithmetic number, because the mean of its divisors is an integer number (9273474).

Almost surely, 2^155440032 is an apocalyptic number.

155440032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155440032 is an abundant number, since it is smaller than the sum of its proper divisors (289686720).

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

155440032 is a wasteful number, since it uses less digits than its factorization.

155440032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147221 (or 147213 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 155440032 is about 12467.5591837376. The cubic root of 155440032 is about 537.6763806937.

Adding to 155440032 its reverse (230044551), we get a palindrome (385484583).

The spelling of 155440032 in words is "one hundred fifty-five million, four hundred forty thousand, thirty-two".