18749639 has 8 divisors (see below), whose sum is σ = 19329840. Its totient is φ = 18173376.

The previous prime is 18749629. The next prime is 18749641. The reversal of 18749639 is 93694781.

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 18749639 - 2²⁴ = 1972423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18749593 and 18749602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18749629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10772 + ... + 12390.

It is an arithmetic number, because the mean of its divisors is an integer number (2416230).

Almost surely, 2^18749639 is an apocalyptic number.

18749639 is a deficient number, since it is larger than the sum of its proper divisors (580201).

18749639 is a wasteful number, since it uses less digits than its factorization.

18749639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969.

The product of its digits is 326592, while the sum is 47.

The square root of 18749639 is about 4330.0853340321. The cubic root of 18749639 is about 265.6629373081.

The spelling of 18749639 in words is "eighteen million, seven hundred forty-nine thousand, six hundred thirty-nine".