18394402 has 16 divisors (see below), whose sum is σ = 30518712. Its totient is φ = 8259840.

The previous prime is 18394379. The next prime is 18394403. The reversal of 18394402 is 20449381.

It can be written as a sum of positive squares in 4 ways, for example, as 17986081 + 408321 = 4241^2 + 639^2 .

It is not an unprimeable number, because it can be changed into a prime (18394403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8599 + ... + 10522.

Almost surely, 2^18394402 is an apocalyptic number.

18394402 is a deficient number, since it is larger than the sum of its proper divisors (12124310).

18394402 is a wasteful number, since it uses less digits than its factorization.

18394402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19173.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18394402 is about 4288.8695480278. The cubic root of 18394402 is about 263.9744484759.

It can be divided in two parts, 1839 and 4402, that added together give a square (6241 = 79²).

The spelling of 18394402 in words is "eighteen million, three hundred ninety-four thousand, four hundred two".