84691899 has 20 divisors (see below), whose sum is σ = 128257096. Its totient is φ = 55683936.

The previous prime is 84691889. The next prime is 84691951. The reversal of 84691899 is 99819648.

It is not a de Polignac number, because 84691899 - 2⁸ = 84691643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84691829) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1249 + ... + 13074.

Almost surely, 2^84691899 is an apocalyptic number.

84691899 is a deficient number, since it is larger than the sum of its proper divisors (43565197).

84691899 is a wasteful number, since it uses less digits than its factorization.

84691899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14408 (or 14399 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 84691899 is about 9202.8201655797. The cubic root of 84691899 is about 439.1510818490.

The spelling of 84691899 in words is "eighty-four million, six hundred ninety-one thousand, eight hundred ninety-nine".