18813412 has 6 divisors (see below), whose sum is σ = 32923478. Its totient is φ = 9406704.

The previous prime is 18813391. The next prime is 18813419. The reversal of 18813412 is 21431881.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 614656 = 4266^2 + 784^2 .

It is not an unprimeable number, because it can be changed into a prime (18813419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2351673 + ... + 2351680.

Almost surely, 2^18813412 is an apocalyptic number.

It is an amenable number.

18813412 is a deficient number, since it is larger than the sum of its proper divisors (14110066).

18813412 is a wasteful number, since it uses less digits than its factorization.

18813412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4703357 (or 4703355 counting only the distinct ones).

The product of its digits is 1536, while the sum is 28.

The square root of 18813412 is about 4337.4430255624. The cubic root of 18813412 is about 265.9637955512.

The spelling of 18813412 in words is "eighteen million, eight hundred thirteen thousand, four hundred twelve".