18639701 has 8 divisors (see below), whose sum is σ = 20015424. Its totient is φ = 17295040.

The previous prime is 18639679. The next prime is 18639737. The reversal of 18639701 is 10793681.

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 18639701 - 2¹⁴ = 18623317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18632701) by changing a digit.

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, 6515 + ... + 8928.

It is an arithmetic number, because the mean of its divisors is an integer number (2501928).

Almost surely, 2^18639701 is an apocalyptic number.

It is an amenable number.

18639701 is a deficient number, since it is larger than the sum of its proper divisors (1375723).

18639701 is a wasteful number, since it uses less digits than its factorization.

18639701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15531.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 18639701 is about 4317.3720015769. The cubic root of 18639701 is about 265.1426833372.

The spelling of 18639701 in words is "eighteen million, six hundred thirty-nine thousand, seven hundred one".