18273969 has 24 divisors (see below), whose sum is σ = 30281472. Its totient is φ = 10402560.

The previous prime is 18273961. The next prime is 18273979. The reversal of 18273969 is 96937281.

It is not a de Polignac number, because 18273969 - 2³ = 18273961 is a prime.

It is a super-2 number, since 2×18273969² = 667875886025922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18273961) 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 23 ways as a sum of consecutive naturals, for example, 26817 + ... + 27489.

It is an arithmetic number, because the mean of its divisors is an integer number (1261728).

Almost surely, 2^18273969 is an apocalyptic number.

It is an amenable number.

18273969 is a deficient number, since it is larger than the sum of its proper divisors (12007503).

18273969 is a wasteful number, since it uses less digits than its factorization.

18273969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117 (or 1114 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 18273969 is about 4274.8063114017. The cubic root of 18273969 is about 263.3970831432.

The spelling of 18273969 in words is "eighteen million, two hundred seventy-three thousand, nine hundred sixty-nine".