155397860 has 12 divisors (see below), whose sum is σ = 326335548. Its totient is φ = 62159136.

The previous prime is 155397841. The next prime is 155397871. The reversal of 155397860 is 68793551.

It can be written as a sum of positive squares in 2 ways, for example, as 23193856 + 132204004 = 4816^2 + 11498^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3884927 + ... + 3884966.

It is an arithmetic number, because the mean of its divisors is an integer number (27194629).

Almost surely, 2^155397860 is an apocalyptic number.

155397860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155397860 is an abundant number, since it is smaller than the sum of its proper divisors (170937688).

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

155397860 is a wasteful number, since it uses less digits than its factorization.

155397860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7769902 (or 7769900 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 155397860 is about 12465.8677997162. The cubic root of 155397860 is about 537.6277511377.

The spelling of 155397860 in words is "one hundred fifty-five million, three hundred ninety-seven thousand, eight hundred sixty".