99999427 has 4 divisors (see below), whose sum is σ = 109090296. Its totient is φ = 90908560.

The previous prime is 99999401. The next prime is 99999437. The reversal of 99999427 is 72499999.

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-99999427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4545418 + ... + 4545439.

It is an arithmetic number, because the mean of its divisors is an integer number (27272574).

Almost surely, 2^99999427 is an apocalyptic number.

99999427 is a deficient number, since it is larger than the sum of its proper divisors (9090869).

99999427 is a wasteful number, since it uses less digits than its factorization.

99999427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9090868.

The product of its digits is 3306744, while the sum is 58.

The square root of 99999427 is about 9999.9713499590. The cubic root of 99999427 is about 464.1579968161.

The spelling of 99999427 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred twenty-seven".