7640139 has 16 divisors (see below), whose sum is σ = 11031552. Its totient is φ = 4675488.

The previous prime is 7640131. The next prime is 7640141. The reversal of 7640139 is 9310467.

It is a happy number.

It is not a de Polignac number, because 7640139 - 2³ = 7640131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7640131) 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 15 ways as a sum of consecutive naturals, for example, 8422 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (689472).

Almost surely, 2^7640139 is an apocalyptic number.

7640139 is a deficient number, since it is larger than the sum of its proper divisors (3391413).

7640139 is a wasteful number, since it uses less digits than its factorization.

7640139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 7640139 is about 2764.0801363202. The cubic root of 7640139 is about 196.9550345294.

It can be divided in two parts, 7 and 640139, that added together give a triangular number (640146 = T₁₁₃₁).

The spelling of 7640139 in words is "seven million, six hundred forty thousand, one hundred thirty-nine".