18870724 has 12 divisors (see below), whose sum is σ = 34762000. Its totient is φ = 8938728.

The previous prime is 18870721. The next prime is 18870727. The reversal of 18870724 is 42707881.

It is an interprime number because it is at equal distance from previous prime (18870721) and next prime (18870727).

It is a super-2 number, since 2×18870724² = 712208448568352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18870721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124074 + ... + 124225.

Almost surely, 2^18870724 is an apocalyptic number.

It is an amenable number.

18870724 is a deficient number, since it is larger than the sum of its proper divisors (15891276).

18870724 is a wasteful number, since it uses less digits than its factorization.

18870724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248322 (or 248320 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 18870724 is about 4344.0446590706. The cubic root of 18870724 is about 266.2335935874.

The spelling of 18870724 in words is "eighteen million, eight hundred seventy thousand, seven hundred twenty-four".