18622457 has 4 divisors (see below), whose sum is σ = 21282816. Its totient is φ = 15962100.

The previous prime is 18622453. The next prime is 18622459. The reversal of 18622457 is 75422681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18622457 - 2² = 18622453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18622453) 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, 1330169 + ... + 1330182.

It is an arithmetic number, because the mean of its divisors is an integer number (5320704).

Almost surely, 2^18622457 is an apocalyptic number.

It is an amenable number.

18622457 is a deficient number, since it is larger than the sum of its proper divisors (2660359).

18622457 is an equidigital number, since it uses as much as digits as its factorization.

18622457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660358.

The product of its digits is 26880, while the sum is 35.

The square root of 18622457 is about 4315.3744912811. The cubic root of 18622457 is about 265.0608949888.

The spelling of 18622457 in words is "eighteen million, six hundred twenty-two thousand, four hundred fifty-seven".