18421892 has 6 divisors (see below), whose sum is σ = 32238318. Its totient is φ = 9210944.

The previous prime is 18421891. The next prime is 18421943. The reversal of 18421892 is 29812481.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 3936256 = 3806^2 + 1984^2 .

It is a super-2 number, since 2×18421892² = 678732209719328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18421891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2302733 + ... + 2302740.

It is an arithmetic number, because the mean of its divisors is an integer number (5373053).

Almost surely, 2^18421892 is an apocalyptic number.

It is an amenable number.

18421892 is a deficient number, since it is larger than the sum of its proper divisors (13816426).

18421892 is a wasteful number, since it uses less digits than its factorization.

18421892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4605477 (or 4605475 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 18421892 is about 4292.0731587428. The cubic root of 18421892 is about 264.1058842178.

The spelling of 18421892 in words is "eighteen million, four hundred twenty-one thousand, eight hundred ninety-two".