18321053 has 16 divisors (see below), whose sum is σ = 20186496. Its totient is φ = 16558080.

The previous prime is 18321013. The next prime is 18321059. The reversal of 18321053 is 35012381.

18321053 = T₈₂₂ + T₈₂₃ + ... + T₈₇₂.

It is a cyclic number.

It is not a de Polignac number, because 18321053 - 2⁶ = 18320989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18321059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51725 + ... + 52077.

It is an arithmetic number, because the mean of its divisors is an integer number (1261656).

Almost surely, 2^18321053 is an apocalyptic number.

It is an amenable number.

18321053 is a deficient number, since it is larger than the sum of its proper divisors (1865443).

18321053 is a wasteful number, since it uses less digits than its factorization.

18321053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 18321053 is about 4280.3099186858. The cubic root of 18321053 is about 263.6231087019.

The spelling of 18321053 in words is "eighteen million, three hundred twenty-one thousand, fifty-three".