83999999 has 2 divisors, whose sum is σ = 84000000. Its totient is φ = 83999998.

The previous prime is 83999947. The next prime is 84000013. The reversal of 83999999 is 99999938.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 83999999 - 2⁸ = 83999743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

83999999 is a modest number, since divided by 9999 gives 8399 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83999099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41999999 + 42000000.

It is an arithmetic number, because the mean of its divisors is an integer number (42000000).

Almost surely, 2^83999999 is an apocalyptic number.

83999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

83999999 is an equidigital number, since it uses as much as digits as its factorization.

83999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12754584, while the sum is 65.

The square root of 83999999 is about 9165.1513353572. The cubic root of 83999999 is about 437.9519122509.

The spelling of 83999999 in words is "eighty-three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".