99439440 has 40 divisors (see below), whose sum is σ = 308263008. Its totient is φ = 26517120.

The previous prime is 99439429. The next prime is 99439441. The reversal of 99439440 is 4493499.

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

It is a junction number, because it is equal to n+sod(n) for n = 99439392 and 99439401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99439441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206926 + ... + 207405.

Almost surely, 2^99439440 is an apocalyptic number.

It is an amenable number.

99439440 is an abundant number, since it is smaller than the sum of its proper divisors (208823568).

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

99439440 is a wasteful number, since it uses less digits than its factorization.

99439440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414347 (or 414341 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 99439440 is about 9971.9326110840. The cubic root of 99439440 is about 463.2899613779.

The spelling of 99439440 in words is "ninety-nine million, four hundred thirty-nine thousand, four hundred forty".