83899981 has 32 divisors (see below), whose sum is σ = 102767616. Its totient is φ = 67584000.

The previous prime is 83899973. The next prime is 83900039. The reversal of 83899981 is 18999838.

It is not a de Polignac number, because 83899981 - 2³ = 83899973 is a prime.

It is a super-2 number, since 2×83899981² = 14078413623600722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83899181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237501 + ... + 237853.

It is an arithmetic number, because the mean of its divisors is an integer number (3211488).

Almost surely, 2^83899981 is an apocalyptic number.

It is an amenable number.

83899981 is a deficient number, since it is larger than the sum of its proper divisors (18867635).

83899981 is a wasteful number, since it uses less digits than its factorization.

83899981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453.

The product of its digits is 1119744, while the sum is 55.

The square root of 83899981 is about 9159.6932808910. The cubic root of 83899981 is about 437.7780214902.

The spelling of 83899981 in words is "eighty-three million, eight hundred ninety-nine thousand, nine hundred eighty-one".