83687939 has 8 divisors (see below), whose sum is σ = 87672000. Its totient is φ = 79777152.

The previous prime is 83687927. The next prime is 83687971. The reversal of 83687939 is 93978638.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83687939 is a prime.

It is a super-2 number, since 2×83687939² = 14007342268135442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83687339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15974 + ... + 20555.

It is an arithmetic number, because the mean of its divisors is an integer number (10959000).

Almost surely, 2^83687939 is an apocalyptic number.

83687939 is a deficient number, since it is larger than the sum of its proper divisors (3984061).

83687939 is a wasteful number, since it uses less digits than its factorization.

83687939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36637.

The product of its digits is 1959552, while the sum is 53.

The square root of 83687939 is about 9148.1112258214. Note that the first 3 decimals coincide. The cubic root of 83687939 is about 437.4089088177.

The spelling of 83687939 in words is "eighty-three million, six hundred eighty-seven thousand, nine hundred thirty-nine".