99900047 has 4 divisors (see below), whose sum is σ = 107584680. Its totient is φ = 92215416.

The previous prime is 99900029. The next prime is 99900077. The reversal of 99900047 is 74000999.

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

It is a cyclic number.

It is not a de Polignac number, because 99900047 - 2¹² = 99895951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99900077) 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, 3842297 + ... + 3842322.

It is an arithmetic number, because the mean of its divisors is an integer number (26896170).

Almost surely, 2^99900047 is an apocalyptic number.

99900047 is a deficient number, since it is larger than the sum of its proper divisors (7684633).

99900047 is a wasteful number, since it uses less digits than its factorization.

99900047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7684632.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 99900047 is about 9995.0011005502. The cubic root of 99900047 is about 464.0041848983.

The spelling of 99900047 in words is "ninety-nine million, nine hundred thousand, forty-seven".