155155840 has 128 divisors (see below), whose sum is σ = 431827200. Its totient is φ = 52205568.

The previous prime is 155155823. The next prime is 155155873. The reversal of 155155840 is 48551551.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×155155840² = 48146669372211200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155155796 and 155155805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264027 + ... + 264613.

It is an arithmetic number, because the mean of its divisors is an integer number (3373650).

Almost surely, 2^155155840 is an apocalyptic number.

155155840 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 155155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215913600).

155155840 is an abundant number, since it is smaller than the sum of its proper divisors (276671360).

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

155155840 is an equidigital number, since it uses as much as digits as its factorization.

155155840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 34.

The square root of 155155840 is about 12456.1567106391. The cubic root of 155155840 is about 537.3485017416.

The spelling of 155155840 in words is "one hundred fifty-five million, one hundred fifty-five thousand, eight hundred forty".