18269973 has 6 divisors (see below), whose sum is σ = 26389974. Its totient is φ = 12179976.

The previous prime is 18269957. The next prime is 18270013. The reversal of 18269973 is 37996281.

It can be written as a sum of positive squares in only one way, i.e., 13972644 + 4297329 = 3738^2 + 2073^2 .

It is not a de Polignac number, because 18269973 - 2⁴ = 18269957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18269903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1014990 + ... + 1015007.

It is an arithmetic number, because the mean of its divisors is an integer number (4398329).

Almost surely, 2^18269973 is an apocalyptic number.

It is an amenable number.

18269973 is a deficient number, since it is larger than the sum of its proper divisors (8120001).

18269973 is a wasteful number, since it uses less digits than its factorization.

18269973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030003 (or 2030000 counting only the distinct ones).

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

The square root of 18269973 is about 4274.3388962505. The cubic root of 18269973 is about 263.3778825803.

The spelling of 18269973 in words is "eighteen million, two hundred sixty-nine thousand, nine hundred seventy-three".