99870423 has 4 divisors (see below), whose sum is σ = 133160568. Its totient is φ = 66580280.

The previous prime is 99870389. The next prime is 99870443. The reversal of 99870423 is 32407899.

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 99870423 - 2⁸ = 99870167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99870443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16645068 + ... + 16645073.

It is an arithmetic number, because the mean of its divisors is an integer number (33290142).

Almost surely, 2^99870423 is an apocalyptic number.

99870423 is a deficient number, since it is larger than the sum of its proper divisors (33290145).

99870423 is a wasteful number, since it uses less digits than its factorization.

99870423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33290144.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 99870423 is about 9993.5190498643. The cubic root of 99870423 is about 463.9583156543.

The spelling of 99870423 in words is "ninety-nine million, eight hundred seventy thousand, four hundred twenty-three".