18022402 has 4 divisors (see below), whose sum is σ = 27033606. Its totient is φ = 9011200.

The previous prime is 18022399. The next prime is 18022429. The reversal of 18022402 is 20422081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17214201 + 808201 = 4149^2 + 899^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18022402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4505599 + ... + 4505602.

Almost surely, 2^18022402 is an apocalyptic number.

18022402 is a deficient number, since it is larger than the sum of its proper divisors (9011204).

18022402 is an equidigital number, since it uses as much as digits as its factorization.

18022402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9011203.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 18022402 is about 4245.2799672106. The cubic root of 18022402 is about 262.1828162906.

Adding to 18022402 its reverse (20422081), we get a palindrome (38444483).

The spelling of 18022402 in words is "eighteen million, twenty-two thousand, four hundred two".