18977492 has 6 divisors (see below), whose sum is σ = 33210618. Its totient is φ = 9488744.

The previous prime is 18977473. The next prime is 18977509. The reversal of 18977492 is 29477981.

It can be written as a sum of positive squares in only one way, i.e., 11600836 + 7376656 = 3406^2 + 2716^2 .

It is a super-2 number, since 2×18977492² = 720290405220128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2372183 + ... + 2372190.

It is an arithmetic number, because the mean of its divisors is an integer number (5535103).

Almost surely, 2^18977492 is an apocalyptic number.

It is an amenable number.

18977492 is a deficient number, since it is larger than the sum of its proper divisors (14233126).

18977492 is a wasteful number, since it uses less digits than its factorization.

18977492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4744377 (or 4744375 counting only the distinct ones).

The product of its digits is 254016, while the sum is 47.

The square root of 18977492 is about 4356.3163337848. The cubic root of 18977492 is about 266.7347541417.

The spelling of 18977492 in words is "eighteen million, nine hundred seventy-seven thousand, four hundred ninety-two".