99423870 has 128 divisors (see below), whose sum is σ = 298045440. Its totient is φ = 20666880.

The previous prime is 99423859. The next prime is 99423899. The reversal of 99423870 is 7832499.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 63 ways as a sum of consecutive naturals, for example, 215440 + ... + 215900.

It is an arithmetic number, because the mean of its divisors is an integer number (2328480).

Almost surely, 2^99423870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99423870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149022720).

99423870 is an abundant number, since it is smaller than the sum of its proper divisors (198621570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99423870 is a wasteful number, since it uses less digits than its factorization.

99423870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570.

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

The square root of 99423870 is about 9971.1518893255. The cubic root of 99423870 is about 463.2657798217.

The spelling of 99423870 in words is "ninety-nine million, four hundred twenty-three thousand, eight hundred seventy".