83973813 has 16 divisors (see below), whose sum is σ = 139593216. Its totient is φ = 43622640.

The previous prime is 83973809. The next prime is 83973817. The reversal of 83973813 is 31837938.

It is an interprime number because it is at equal distance from previous prime (83973809) and next prime (83973817).

It is not a de Polignac number, because 83973813 - 2² = 83973809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83973817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181531 + ... + 181992.

It is an arithmetic number, because the mean of its divisors is an integer number (8724576).

Almost surely, 2^83973813 is an apocalyptic number.

It is an amenable number.

83973813 is a deficient number, since it is larger than the sum of its proper divisors (55619403).

83973813 is a wasteful number, since it uses less digits than its factorization.

83973813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363544.

The product of its digits is 108864, while the sum is 42.

The square root of 83973813 is about 9163.7226605785. The cubic root of 83973813 is about 437.9063987556.

The spelling of 83973813 in words is "eighty-three million, nine hundred seventy-three thousand, eight hundred thirteen".