18930724 has 12 divisors (see below), whose sum is σ = 35077644. Its totient is φ = 8908544.

The previous prime is 18930721. The next prime is 18930727. The reversal of 18930724 is 42703981.

It is an interprime number because it is at equal distance from previous prime (18930721) and next prime (18930727).

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 6200100 = 3568^2 + 2490^2 .

It is a super-2 number, since 2×18930724² = 716744622328352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 18930724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18930721) 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, 139129 + ... + 139264.

It is an arithmetic number, because the mean of its divisors is an integer number (2923137).

Almost surely, 2^18930724 is an apocalyptic number.

It is an amenable number.

18930724 is a deficient number, since it is larger than the sum of its proper divisors (16146920).

18930724 is a wasteful number, since it uses less digits than its factorization.

18930724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278414 (or 278412 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18930724 is about 4350.9451846696. The cubic root of 18930724 is about 266.5154608069.

The spelling of 18930724 in words is "eighteen million, nine hundred thirty thousand, seven hundred twenty-four".