83138957 has 4 divisors (see below), whose sum is σ = 90697056. Its totient is φ = 75580860.

The previous prime is 83138947. The next prime is 83138983. The reversal of 83138957 is 75983138.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83138957 - 2⁸ = 83138701 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 (83138947) 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, 3779033 + ... + 3779054.

It is an arithmetic number, because the mean of its divisors is an integer number (22674264).

Almost surely, 2^83138957 is an apocalyptic number.

It is an amenable number.

83138957 is a deficient number, since it is larger than the sum of its proper divisors (7558099).

83138957 is a wasteful number, since it uses less digits than its factorization.

83138957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7558098.

The product of its digits is 181440, while the sum is 44.

The square root of 83138957 is about 9118.0566460184. The cubic root of 83138957 is about 436.4503612442.

The spelling of 83138957 in words is "eighty-three million, one hundred thirty-eight thousand, nine hundred fifty-seven".