18923797 has 2 divisors, whose sum is σ = 18923798. Its totient is φ = 18923796.

The previous prime is 18923789. The next prime is 18923831. The reversal of 18923797 is 79732981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13476241 + 5447556 = 3671^2 + 2334^2 .

It is a cyclic number.

It is not a de Polignac number, because 18923797 - 2³ = 18923789 is a prime.

It is a super-2 number, since 2×18923797² = 716220185794418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18923767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461898 + 9461899.

It is an arithmetic number, because the mean of its divisors is an integer number (9461899).

Almost surely, 2^18923797 is an apocalyptic number.

It is an amenable number.

18923797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18923797 is an equidigital number, since it uses as much as digits as its factorization.

18923797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 18923797 is about 4350.1490779053. The cubic root of 18923797 is about 266.4829496746.

The spelling of 18923797 in words is "eighteen million, nine hundred twenty-three thousand, seven hundred ninety-seven".