7639994 has 4 divisors (see below), whose sum is σ = 11459994. Its totient is φ = 3819996.

The previous prime is 7639993. The next prime is 7639997. The reversal of 7639994 is 4999367.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4999367 = 263 ⋅19009.

It can be written as a sum of positive squares in only one way, i.e., 7425625 + 214369 = 2725^2 + 463^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7639993) 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 as a sum of consecutive naturals, namely, 1909997 + ... + 1910000.

Almost surely, 2^7639994 is an apocalyptic number.

7639994 is a deficient number, since it is larger than the sum of its proper divisors (3820000).

7639994 is a wasteful number, since it uses less digits than its factorization.

7639994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819999.

The product of its digits is 367416, while the sum is 47.

The square root of 7639994 is about 2764.0539068549. The cubic root of 7639994 is about 196.9537885372.

The spelling of 7639994 in words is "seven million, six hundred thirty-nine thousand, nine hundred ninety-four".