155894840 has 32 divisors (see below), whose sum is σ = 352356480. Its totient is φ = 62074752.

The previous prime is 155894839. The next prime is 155894857. The reversal of 155894840 is 48498551.

It is a super-2 number, since 2×155894840² = 48606402277251200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 155894791 and 155894800.

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 7 ways as a sum of consecutive naturals, for example, 182 + ... + 17658.

It is an arithmetic number, because the mean of its divisors is an integer number (11011140).

Almost surely, 2^155894840 is an apocalyptic number.

155894840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155894840 is an abundant number, since it is smaller than the sum of its proper divisors (196461640).

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

155894840 is a wasteful number, since it uses less digits than its factorization.

155894840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17711 (or 17707 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 44.

The square root of 155894840 is about 12485.7855179400. The cubic root of 155894840 is about 538.2002727710.

The spelling of 155894840 in words is "one hundred fifty-five million, eight hundred ninety-four thousand, eight hundred forty".