18917492 has 12 divisors (see below), whose sum is σ = 36115296. Its totient is φ = 8598840.

The previous prime is 18917491. The next prime is 18917497. The reversal of 18917492 is 29471981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18917491) 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, 214928 + ... + 215015.

It is an arithmetic number, because the mean of its divisors is an integer number (3009608).

Almost surely, 2^18917492 is an apocalyptic number.

It is an amenable number.

18917492 is a deficient number, since it is larger than the sum of its proper divisors (17197804).

18917492 is a wasteful number, since it uses less digits than its factorization.

18917492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429958 (or 429956 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 18917492 is about 4349.4243297246. The cubic root of 18917492 is about 266.4533509348.

The spelling of 18917492 in words is "eighteen million, nine hundred seventeen thousand, four hundred ninety-two".