157861000 has 128 divisors (see below), whose sum is σ = 409743360. Its totient is φ = 56448000.

The previous prime is 157860973. The next prime is 157861003. The reversal of 157861000 is 168751.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 157861000.

It is not an unprimeable number, because it can be changed into a prime (157861003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1242937 + ... + 1243063.

It is an arithmetic number, because the mean of its divisors is an integer number (3201120).

Almost surely, 2^157861000 is an apocalyptic number.

157861000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157861000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204871680).

157861000 is an abundant number, since it is smaller than the sum of its proper divisors (251882360).

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

157861000 is a wasteful number, since it uses less digits than its factorization.

157861000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 157861000 is about 12564.2747502592. The cubic root of 157861000 is about 540.4534371585.

The spelling of 157861000 in words is "one hundred fifty-seven million, eight hundred sixty-one thousand".