157861998 has 24 divisors (see below), whose sum is σ = 390896688. Its totient is φ = 45103392.

The previous prime is 157861997. The next prime is 157861999. The reversal of 157861998 is 899168751.

157861998 is a `hidden beast` number, since 1 + 578 + 61 + 9 + 9 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (157861997) and next prime (157861999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157861997) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 626311 + ... + 626562.

It is an arithmetic number, because the mean of its divisors is an integer number (16287362).

Almost surely, 2^157861998 is an apocalyptic number.

157861998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

157861998 is an abundant number, since it is smaller than the sum of its proper divisors (233034690).

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

157861998 is a wasteful number, since it uses less digits than its factorization.

157861998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252888 (or 1252885 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 157861998 is about 12564.3144659786. The cubic root of 157861998 is about 540.4545760748.

The spelling of 157861998 in words is "one hundred fifty-seven million, eight hundred sixty-one thousand, nine hundred ninety-eight".