83391399 has 96 divisors (see below), whose sum is σ = 163537920. Its totient is φ = 39688704.

The previous prime is 83391397. The next prime is 83391439. The reversal of 83391399 is 99319338.

It is not a de Polignac number, because 83391399 - 2¹ = 83391397 is a prime.

It is a super-4 number, since 4×83391399⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83391391) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 357787 + ... + 358019.

It is an arithmetic number, because the mean of its divisors is an integer number (1703520).

Almost surely, 2^83391399 is an apocalyptic number.

83391399 is a deficient number, since it is larger than the sum of its proper divisors (80146521).

83391399 is a wasteful number, since it uses less digits than its factorization.

83391399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 298 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 83391399 is about 9131.8891254767. The cubic root of 83391399 is about 436.8916588783.

The spelling of 83391399 in words is "eighty-three million, three hundred ninety-one thousand, three hundred ninety-nine".