18406699 has 6 divisors (see below), whose sum is σ = 19553444. Its totient is φ = 17323680.

The previous prime is 18406691. The next prime is 18406711. The reversal of 18406699 is 99660481.

It is not a de Polignac number, because 18406699 - 2³ = 18406691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18406691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31557 + ... + 32134.

Almost surely, 2^18406699 is an apocalyptic number.

18406699 is a deficient number, since it is larger than the sum of its proper divisors (1146745).

18406699 is an equidigital number, since it uses as much as digits as its factorization.

18406699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63725 (or 63708 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 18406699 is about 4290.3029030594. The cubic root of 18406699 is about 264.0332593160.

The spelling of 18406699 in words is "eighteen million, four hundred six thousand, six hundred ninety-nine".