1855387157 has 16 divisors (see below), whose sum is σ = 2119283712. Its totient is φ = 1609148160.

The previous prime is 1855387141. The next prime is 1855387159. The reversal of 1855387157 is 7517835581.

It is a cyclic number.

It is not a de Polignac number, because 1855387157 - 2⁴ = 1855387141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855387159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127232 + ... + 141062.

It is an arithmetic number, because the mean of its divisors is an integer number (132455232).

Almost surely, 2^1855387157 is an apocalyptic number.

1855387157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1855387157 is a deficient number, since it is larger than the sum of its proper divisors (263896555).

1855387157 is a wasteful number, since it uses less digits than its factorization.

1855387157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14468.

The product of its digits is 1176000, while the sum is 50.

The square root of 1855387157 is about 43074.2052393309. The cubic root of 1855387157 is about 1228.7914533250.

The spelling of 1855387157 in words is "one billion, eight hundred fifty-five million, three hundred eighty-seven thousand, one hundred fifty-seven".