76139957 has 4 divisors (see below), whose sum is σ = 80618796. Its totient is φ = 71661120.

The previous prime is 76139933. The next prime is 76139989. The reversal of 76139957 is 75993167.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75993167 = 1321 ⋅57527.

It can be written as a sum of positive squares in 2 ways, for example, as 68790436 + 7349521 = 8294^2 + 2711^2 .

It is not a de Polignac number, because 76139957 - 2¹⁶ = 76074421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76139927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2239394 + ... + 2239427.

It is an arithmetic number, because the mean of its divisors is an integer number (20154699).

Almost surely, 2^76139957 is an apocalyptic number.

It is an amenable number.

76139957 is a deficient number, since it is larger than the sum of its proper divisors (4478839).

76139957 is a wasteful number, since it uses less digits than its factorization.

76139957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478838.

The product of its digits is 357210, while the sum is 47.

The square root of 76139957 is about 8725.8212793983. The cubic root of 76139957 is about 423.8422135240.

The spelling of 76139957 in words is "seventy-six million, one hundred thirty-nine thousand, nine hundred fifty-seven".