18421708 has 12 divisors (see below), whose sum is σ = 33109552. Its totient is φ = 8961840.

The previous prime is 18421681. The next prime is 18421709. The reversal of 18421708 is 80712481.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18421708.

It is not an unprimeable number, because it can be changed into a prime (18421709) 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, 62088 + ... + 62383.

Almost surely, 2^18421708 is an apocalyptic number.

It is an amenable number.

18421708 is a deficient number, since it is larger than the sum of its proper divisors (14687844).

18421708 is a wasteful number, since it uses less digits than its factorization.

18421708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124512 (or 124510 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18421708 is about 4292.0517238263. The cubic root of 18421708 is about 264.1050049081.

The spelling of 18421708 in words is "eighteen million, four hundred twenty-one thousand, seven hundred eight".