18709499 has 2 divisors, whose sum is σ = 18709500. Its totient is φ = 18709498.

The previous prime is 18709487. The next prime is 18709517. The reversal of 18709499 is 99490781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18709499 - 2²⁴ = 1932283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18709799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354749 + 9354750.

It is an arithmetic number, because the mean of its divisors is an integer number (9354750).

Almost surely, 2^18709499 is an apocalyptic number.

18709499 is a deficient number, since it is larger than the sum of its proper divisors (1).

18709499 is an equidigital number, since it uses as much as digits as its factorization.

18709499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 18709499 is about 4325.4478380857. The cubic root of 18709499 is about 265.4732211374.

The spelling of 18709499 in words is "eighteen million, seven hundred nine thousand, four hundred ninety-nine".