99443920 has 40 divisors (see below), whose sum is σ = 232116840. Its totient is φ = 39621120.

The previous prime is 99443909. The next prime is 99443947. The reversal of 99443920 is 2934499.

It can be written as a sum of positive squares in 4 ways, for example, as 3136 + 99440784 = 56^2 + 9972^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19210 + ... + 23830.

It is an arithmetic number, because the mean of its divisors is an integer number (5802921).

Almost surely, 2^99443920 is an apocalyptic number.

It is an amenable number.

99443920 is an abundant number, since it is smaller than the sum of its proper divisors (132672920).

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

99443920 is a wasteful number, since it uses less digits than its factorization.

99443920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4903 (or 4897 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 99443920 is about 9972.1572390331. The cubic root of 99443920 is about 463.2969187376.

The spelling of 99443920 in words is "ninety-nine million, four hundred forty-three thousand, nine hundred twenty".