18809402 has 8 divisors (see below), whose sum is σ = 28245396. Its totient is φ = 9394272.

The previous prime is 18809393. The next prime is 18809419. The reversal of 18809402 is 20490881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17147881 + 1661521 = 4141^2 + 1289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2723 + ... + 6710.

Almost surely, 2^18809402 is an apocalyptic number.

18809402 is a deficient number, since it is larger than the sum of its proper divisors (9435994).

18809402 is an equidigital number, since it uses as much as digits as its factorization.

18809402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10432.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18809402 is about 4336.9807470174. The cubic root of 18809402 is about 265.9448978520.

The spelling of 18809402 in words is "eighteen million, eight hundred nine thousand, four hundred two".