18404402 has 8 divisors (see below), whose sum is σ = 27772416. Its totient is φ = 9146932.

The previous prime is 18404383. The next prime is 18404453. The reversal of 18404402 is 20440481.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27218 + ... + 27885.

It is an arithmetic number, because the mean of its divisors is an integer number (3471552).

Almost surely, 2^18404402 is an apocalyptic number.

18404402 is a deficient number, since it is larger than the sum of its proper divisors (9368014).

18404402 is a wasteful number, since it uses less digits than its factorization.

18404402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55272.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18404402 is about 4290.0351979908. The cubic root of 18404402 is about 264.0222758216.

Adding to 18404402 its reverse (20440481), we get a palindrome (38844883).

The spelling of 18404402 in words is "eighteen million, four hundred four thousand, four hundred two".