8749639 has 4 divisors (see below), whose sum is σ = 8757760. Its totient is φ = 8741520.

The previous prime is 8749627. The next prime is 8749651. The reversal of 8749639 is 9369478.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (8749627) and next prime (8749651).

It is a cyclic number.

It is not a de Polignac number, because 8749639 - 2⁵ = 8749607 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 (8749669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142 + ... + 4699.

It is an arithmetic number, because the mean of its divisors is an integer number (2189440).

Almost surely, 2^8749639 is an apocalyptic number.

8749639 is a deficient number, since it is larger than the sum of its proper divisors (8121).

8749639 is a wasteful number, since it uses less digits than its factorization.

8749639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8120.

The product of its digits is 326592, while the sum is 46.

The square root of 8749639 is about 2957.9788707832. The cubic root of 8749639 is about 206.0614310772.

The spelling of 8749639 in words is "eight million, seven hundred forty-nine thousand, six hundred thirty-nine".