99979895 has 4 divisors (see below), whose sum is σ = 119975880. Its totient is φ = 79983912.

The previous prime is 99979871. The next prime is 99979903. The reversal of 99979895 is 59897999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99979895 is a prime.

It is a super-2 number, since 2×99979895² = 19991958808422050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9997985 + ... + 9997994.

It is an arithmetic number, because the mean of its divisors is an integer number (29993970).

Almost surely, 2^99979895 is an apocalyptic number.

99979895 is a deficient number, since it is larger than the sum of its proper divisors (19995985).

99979895 is a wasteful number, since it uses less digits than its factorization.

99979895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19995984.

The product of its digits is 16533720, while the sum is 65.

The square root of 99979895 is about 9998.9946994685. The cubic root of 99979895 is about 464.1277748952.

The spelling of 99979895 in words is "ninety-nine million, nine hundred seventy-nine thousand, eight hundred ninety-five".