18909996 has 24 divisors (see below), whose sum is σ = 50426880. Its totient is φ = 5402832.

The previous prime is 18909991. The next prime is 18910007. The reversal of 18909996 is 69990981.

It is not an unprimeable number, because it can be changed into a prime (18909991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112476 + ... + 112643.

It is an arithmetic number, because the mean of its divisors is an integer number (2101120).

Almost surely, 2^18909996 is an apocalyptic number.

It is an amenable number.

18909996 is an abundant number, since it is smaller than the sum of its proper divisors (31516884).

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

18909996 is a wasteful number, since it uses less digits than its factorization.

18909996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225133 (or 225131 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 18909996 is about 4348.5625211097. The cubic root of 18909996 is about 266.4181525024.

The spelling of 18909996 in words is "eighteen million, nine hundred nine thousand, nine hundred ninety-six".