99690947 has 16 divisors (see below), whose sum is σ = 108656640. Its totient is φ = 91185600.

The previous prime is 99690923. The next prime is 99690949. The reversal of 99690947 is 74909699.

99690947 = 989² + 990² + ... + 1081².

It is a cyclic number.

It is not a de Polignac number, because 99690947 - 2⁶ = 99690883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99690949) 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, 62672 + ... + 64242.

It is an arithmetic number, because the mean of its divisors is an integer number (6791040).

Almost surely, 2^99690947 is an apocalyptic number.

99690947 is a deficient number, since it is larger than the sum of its proper divisors (8965693).

99690947 is a wasteful number, since it uses less digits than its factorization.

99690947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 99690947 is about 9984.5353922954. The cubic root of 99690947 is about 463.6802242674.

The spelling of 99690947 in words is "ninety-nine million, six hundred ninety thousand, nine hundred forty-seven".