7638739 has 4 divisors (see below), whose sum is σ = 7730856. Its totient is φ = 7546624.

The previous prime is 7638733. The next prime is 7638767. The reversal of 7638739 is 9378367.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7638739 - 2⁵ = 7638707 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7638695 and 7638704.

It is not an unprimeable number, because it can be changed into a prime (7638733) 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 3 ways as a sum of consecutive naturals, for example, 45934 + ... + 46099.

It is an arithmetic number, because the mean of its divisors is an integer number (1932714).

Almost surely, 2^7638739 is an apocalyptic number.

7638739 is a deficient number, since it is larger than the sum of its proper divisors (92117).

7638739 is an equidigital number, since it uses as much as digits as its factorization.

7638739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92116.

The product of its digits is 190512, while the sum is 43.

The square root of 7638739 is about 2763.8268759096. The cubic root of 7638739 is about 196.9430036011.

The spelling of 7638739 in words is "seven million, six hundred thirty-eight thousand, seven hundred thirty-nine".