18639741 has 16 divisors (see below), whose sum is σ = 26264000. Its totient is φ = 11726208.

The previous prime is 18639739. The next prime is 18639787. The reversal of 18639741 is 14793681.

It is not a de Polignac number, because 18639741 - 2¹ = 18639739 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18639741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19425 + ... + 20361.

It is an arithmetic number, because the mean of its divisors is an integer number (1641500).

Almost surely, 2^18639741 is an apocalyptic number.

It is an amenable number.

18639741 is a deficient number, since it is larger than the sum of its proper divisors (7624259).

18639741 is a wasteful number, since it uses less digits than its factorization.

18639741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its digits is 36288, while the sum is 39.

The square root of 18639741 is about 4317.3766340221. The cubic root of 18639741 is about 265.1428729987.

The spelling of 18639741 in words is "eighteen million, six hundred thirty-nine thousand, seven hundred forty-one".