18921104 has 20 divisors (see below), whose sum is σ = 36830976. Its totient is φ = 9416352.

The previous prime is 18921103. The next prime is 18921107. The reversal of 18921104 is 40112981.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18921103) 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, 917 + ... + 6219.

Almost surely, 2^18921104 is an apocalyptic number.

It is an amenable number.

18921104 is a deficient number, since it is larger than the sum of its proper divisors (17909872).

18921104 is a wasteful number, since it uses less digits than its factorization.

18921104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5534 (or 5528 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18921104 is about 4349.8395372703. The cubic root of 18921104 is about 266.4703082259.

The spelling of 18921104 in words is "eighteen million, nine hundred twenty-one thousand, one hundred four".