7440139 has 4 divisors (see below), whose sum is σ = 8503024. Its totient is φ = 6377256.

The previous prime is 7440127. The next prime is 7440151. The reversal of 7440139 is 9310447.

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

It is an interprime number because it is at equal distance from previous prime (7440127) and next prime (7440151).

It is a cyclic number.

It is not a de Polignac number, because 7440139 - 2⁵ = 7440107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7440539) 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, 531432 + ... + 531445.

It is an arithmetic number, because the mean of its divisors is an integer number (2125756).

Almost surely, 2^7440139 is an apocalyptic number.

7440139 is a deficient number, since it is larger than the sum of its proper divisors (1062885).

7440139 is a wasteful number, since it uses less digits than its factorization.

7440139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062884.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 7440139 is about 2727.6618192144. The cubic root of 7440139 is about 195.2212172779.

The spelling of 7440139 in words is "seven million, four hundred forty thousand, one hundred thirty-nine".