18408923 has 4 divisors (see below), whose sum is σ = 19825008. Its totient is φ = 16992840.

The previous prime is 18408917. The next prime is 18408937. The reversal of 18408923 is 32980481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18408923 - 2¹⁶ = 18343387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18408953) 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, 708023 + ... + 708048.

It is an arithmetic number, because the mean of its divisors is an integer number (4956252).

Almost surely, 2^18408923 is an apocalyptic number.

18408923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18408923 is a deficient number, since it is larger than the sum of its proper divisors (1416085).

18408923 is a wasteful number, since it uses less digits than its factorization.

18408923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416084.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18408923 is about 4290.5620843894. The cubic root of 18408923 is about 264.0438928779.

The spelling of 18408923 in words is "eighteen million, four hundred eight thousand, nine hundred twenty-three".