18266997 has 16 divisors (see below), whose sum is σ = 27924480. Its totient is φ = 10404912.

The previous prime is 18266981. The next prime is 18267001. The reversal of 18266997 is 79966281.

It is not a de Polignac number, because 18266997 - 2⁴ = 18266981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18266957) 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, 6328 + ... + 8750.

It is an arithmetic number, because the mean of its divisors is an integer number (1745280).

Almost surely, 2^18266997 is an apocalyptic number.

It is an amenable number.

18266997 is a deficient number, since it is larger than the sum of its proper divisors (9657483).

18266997 is a wasteful number, since it uses less digits than its factorization.

18266997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792.

The product of its digits is 326592, while the sum is 48.

The square root of 18266997 is about 4273.9907580621. The cubic root of 18266997 is about 263.3635812430.

The spelling of 18266997 in words is "eighteen million, two hundred sixty-six thousand, nine hundred ninety-seven".