18906637 has 8 divisors (see below), whose sum is σ = 19929240. Its totient is φ = 17908800.

The previous prime is 18906599. The next prime is 18906659. The reversal of 18906637 is 73660981.

It can be written as a sum of positive squares in 4 ways, for example, as 3493161 + 15413476 = 1869^2 + 3926^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18906637 - 2⁷ = 18906509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18906637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18906697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4614 + ... + 7687.

It is an arithmetic number, because the mean of its divisors is an integer number (2491155).

Almost surely, 2^18906637 is an apocalyptic number.

It is an amenable number.

18906637 is a deficient number, since it is larger than the sum of its proper divisors (1022603).

18906637 is a wasteful number, since it uses less digits than its factorization.

18906637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12383.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 18906637 is about 4348.1762843749. The cubic root of 18906637 is about 266.4023768677.

The spelling of 18906637 in words is "eighteen million, nine hundred six thousand, six hundred thirty-seven".