18661474 has 16 divisors (see below), whose sum is σ = 30381120. Its totient is φ = 8545680.

The previous prime is 18661469. The next prime is 18661481. The reversal of 18661474 is 47416681.

It is a happy number.

It is a super-2 number, since 2×18661474² = 696501223705352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667 + ... + 6145.

It is an arithmetic number, because the mean of its divisors is an integer number (1898820).

Almost surely, 2^18661474 is an apocalyptic number.

18661474 is a deficient number, since it is larger than the sum of its proper divisors (11719646).

18661474 is a wasteful number, since it uses less digits than its factorization.

18661474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625.

The product of its digits is 32256, while the sum is 37.

The square root of 18661474 is about 4319.8928227446. The cubic root of 18661474 is about 265.2458807241.

The spelling of 18661474 in words is "eighteen million, six hundred sixty-one thousand, four hundred seventy-four".