18897406 has 16 divisors (see below), whose sum is σ = 30990960. Its totient is φ = 8570880.

The previous prime is 18897391. The next prime is 18897449. The reversal of 18897406 is 60479881.

It is a super-2 number, since 2×18897406² = 714223907057672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16360 + ... + 17476.

It is an arithmetic number, because the mean of its divisors is an integer number (1936935).

Almost surely, 2^18897406 is an apocalyptic number.

18897406 is a deficient number, since it is larger than the sum of its proper divisors (12093554).

18897406 is a wasteful number, since it uses less digits than its factorization.

18897406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18897406 is about 4347.1146752760. The cubic root of 18897406 is about 266.3590136002.

The spelling of 18897406 in words is "eighteen million, eight hundred ninety-seven thousand, four hundred six".