99970123 has 4 divisors (see below), whose sum is σ = 109058328. Its totient is φ = 90881920.

The previous prime is 99970111. The next prime is 99970127. The reversal of 99970123 is 32107999.

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-99970123 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99970127) 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, 4544086 + ... + 4544107.

It is an arithmetic number, because the mean of its divisors is an integer number (27264582).

Almost surely, 2^99970123 is an apocalyptic number.

99970123 is a deficient number, since it is larger than the sum of its proper divisors (9088205).

99970123 is a wasteful number, since it uses less digits than its factorization.

99970123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9088204.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 99970123 is about 9998.5060384039. The cubic root of 99970123 is about 464.1126531737.

The spelling of 99970123 in words is "ninety-nine million, nine hundred seventy thousand, one hundred twenty-three".