155401857 has 24 divisors (see below), whose sum is σ = 244246184. Its totient is φ = 94639104.

The previous prime is 155401847. The next prime is 155401859. The reversal of 155401857 is 758104551.

It can be written as a sum of positive squares in 4 ways, for example, as 42107121 + 113294736 = 6489^2 + 10644^2 .

It is not a de Polignac number, because 155401857 - 2¹⁵ = 155369089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155401859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4503 + ... + 18195.

Almost surely, 2^155401857 is an apocalyptic number.

It is an amenable number.

155401857 is a deficient number, since it is larger than the sum of its proper divisors (88844327).

155401857 is a wasteful number, since it uses less digits than its factorization.

155401857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13809 (or 13806 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The square root of 155401857 is about 12466.0281164451. The cubic root of 155401857 is about 537.6323605527.

The spelling of 155401857 in words is "one hundred fifty-five million, four hundred one thousand, eight hundred fifty-seven".