18718974 has 12 divisors (see below), whose sum is σ = 40557816. Its totient is φ = 6239652.

The previous prime is 18718969. The next prime is 18718979. The reversal of 18718974 is 47981781.

It is an interprime number because it is at equal distance from previous prime (18718969) and next prime (18718979).

It is a super-2 number, since 2×18718974² = 700799975225352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 519954 + ... + 519989.

It is an arithmetic number, because the mean of its divisors is an integer number (3379818).

Almost surely, 2^18718974 is an apocalyptic number.

18718974 is an abundant number, since it is smaller than the sum of its proper divisors (21838842).

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

18718974 is a wasteful number, since it uses less digits than its factorization.

18718974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039951 (or 1039948 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 18718974 is about 4326.5429617652. The cubic root of 18718974 is about 265.5180278650.

The spelling of 18718974 in words is "eighteen million, seven hundred eighteen thousand, nine hundred seventy-four".