7638913 has 4 divisors (see below), whose sum is σ = 7706628. Its totient is φ = 7571200.

The previous prime is 7638901. The next prime is 7638929. The reversal of 7638913 is 3198367.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3198367 = 101 ⋅31667.

It can be written as a sum of positive squares in 2 ways, for example, as 4297329 + 3341584 = 2073^2 + 1828^2 .

It is a cyclic number.

It is not a de Polignac number, because 7638913 - 2⁵ = 7638881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7638973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33688 + ... + 33913.

It is an arithmetic number, because the mean of its divisors is an integer number (1926657).

Almost surely, 2^7638913 is an apocalyptic number.

It is an amenable number.

7638913 is a deficient number, since it is larger than the sum of its proper divisors (67715).

7638913 is a wasteful number, since it uses less digits than its factorization.

7638913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67714.

The product of its digits is 27216, while the sum is 37.

The square root of 7638913 is about 2763.8583538235. The cubic root of 7638913 is about 196.9444989536.

The spelling of 7638913 in words is "seven million, six hundred thirty-eight thousand, nine hundred thirteen".