18622997 has 4 divisors (see below), whose sum is σ = 18668940. Its totient is φ = 18577056.

The previous prime is 18622969. The next prime is 18623009. The reversal of 18622997 is 79922681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13645636 + 4977361 = 3694^2 + 2231^2 .

It is a cyclic number.

It is not a de Polignac number, because 18622997 - 2²⁰ = 17574421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18628997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22358 + ... + 23175.

It is an arithmetic number, because the mean of its divisors is an integer number (4667235).

Almost surely, 2^18622997 is an apocalyptic number.

It is an amenable number.

18622997 is a deficient number, since it is larger than the sum of its proper divisors (45943).

18622997 is an equidigital number, since it uses as much as digits as its factorization.

18622997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45942.

The product of its digits is 108864, while the sum is 44.

The square root of 18622997 is about 4315.4370578193. The cubic root of 18622997 is about 265.0634569761.

The spelling of 18622997 in words is "eighteen million, six hundred twenty-two thousand, nine hundred ninety-seven".