99989479 has 2 divisors, whose sum is σ = 99989480. Its totient is φ = 99989478.

The previous prime is 99989459. The next prime is 99989489. The reversal of 99989479 is 97498999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99989479 - 2²³ = 91600871 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99989479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99989459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49994739 + 49994740.

It is an arithmetic number, because the mean of its divisors is an integer number (49994740).

Almost surely, 2^99989479 is an apocalyptic number.

99989479 is a deficient number, since it is larger than the sum of its proper divisors (1).

99989479 is an equidigital number, since it uses as much as digits as its factorization.

99989479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13226976, while the sum is 64.

The square root of 99989479 is about 9999.4739361628. The cubic root of 99989479 is about 464.1426047383.

The spelling of 99989479 in words is "ninety-nine million, nine hundred eighty-nine thousand, four hundred seventy-nine".