18818402 has 8 divisors (see below), whose sum is σ = 28417500. Its totient is φ = 9345904.

The previous prime is 18818399. The next prime is 18818407. The reversal of 18818402 is 20481881.

It can be written as a sum of positive squares in 2 ways, for example, as 16654561 + 2163841 = 4081^2 + 1471^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18818407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31277 + ... + 31872.

Almost surely, 2^18818402 is an apocalyptic number.

18818402 is a deficient number, since it is larger than the sum of its proper divisors (9599098).

18818402 is a wasteful number, since it uses less digits than its factorization.

18818402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63300.

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 18818402 is about 4338.0182111190. The cubic root of 18818402 is about 265.9873078912.

The spelling of 18818402 in words is "eighteen million, eight hundred eighteen thousand, four hundred two".