18399057 has 16 divisors (see below), whose sum is σ = 25872000. Its totient is φ = 11607552.

The previous prime is 18399047. The next prime is 18399067. The reversal of 18399057 is 75099381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18399047) and next prime (18399067).

It is not a de Polignac number, because 18399057 - 2¹⁶ = 18333521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18399047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5319 + ... + 8067.

It is an arithmetic number, because the mean of its divisors is an integer number (1617000).

Almost surely, 2^18399057 is an apocalyptic number.

It is an amenable number.

18399057 is a deficient number, since it is larger than the sum of its proper divisors (7472943).

18399057 is a wasteful number, since it uses less digits than its factorization.

18399057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 18399057 is about 4289.4121974928. The cubic root of 18399057 is about 263.9967142612.

The spelling of 18399057 in words is "eighteen million, three hundred ninety-nine thousand, fifty-seven".