18089402 has 4 divisors (see below), whose sum is σ = 27134106. Its totient is φ = 9044700.

The previous prime is 18089371. The next prime is 18089413. The reversal of 18089402 is 20498081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20498081 = 167 ⋅122743.

It can be written as a sum of positive squares in only one way, i.e., 12524521 + 5564881 = 3539^2 + 2359^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4522349 + ... + 4522352.

Almost surely, 2^18089402 is an apocalyptic number.

18089402 is a deficient number, since it is larger than the sum of its proper divisors (9044704).

18089402 is an equidigital number, since it uses as much as digits as its factorization.

18089402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044703.

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

The square root of 18089402 is about 4253.1637636000. The cubic root of 18089402 is about 262.5073110587.

The spelling of 18089402 in words is "eighteen million, eighty-nine thousand, four hundred two".