18402322 has 4 divisors (see below), whose sum is σ = 27603486. Its totient is φ = 9201160.

The previous prime is 18402311. The next prime is 18402337. The reversal of 18402322 is 22320481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22320481 = 139 ⋅160579.

It can be written as a sum of positive squares in only one way, i.e., 15515721 + 2886601 = 3939^2 + 1699^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18402293 and 18402302.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4600579 + ... + 4600582.

Almost surely, 2^18402322 is an apocalyptic number.

18402322 is a deficient number, since it is larger than the sum of its proper divisors (9201164).

18402322 is an equidigital number, since it uses as much as digits as its factorization.

18402322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9201163.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 18402322 is about 4289.7927688876. The cubic root of 18402322 is about 264.0123291610.

The spelling of 18402322 in words is "eighteen million, four hundred two thousand, three hundred twenty-two".