18916497 has 20 divisors (see below), whose sum is σ = 29236020. Its totient is φ = 12174624.

The previous prime is 18916493. The next prime is 18916501. The reversal of 18916497 is 79461981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18916493) and next prime (18916501).

It can be written as a sum of positive squares in 2 ways, for example, as 12383361 + 6533136 = 3519^2 + 2556^2 .

It is not a de Polignac number, because 18916497 - 2² = 18916493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18916493) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1678 + ... + 6375.

It is an arithmetic number, because the mean of its divisors is an integer number (1461801).

Almost surely, 2^18916497 is an apocalyptic number.

It is an amenable number.

18916497 is a deficient number, since it is larger than the sum of its proper divisors (10319523).

18916497 is an equidigital number, since it uses as much as digits as its factorization.

18916497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8094 (or 8085 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 18916497 is about 4349.3099452672. The cubic root of 18916497 is about 266.4486793195.

The spelling of 18916497 in words is "eighteen million, nine hundred sixteen thousand, four hundred ninety-seven".