99439425 has 18 divisors (see below), whose sum is σ = 178107462. Its totient is φ = 53034240.

The previous prime is 99439397. The next prime is 99439429. The reversal of 99439425 is 52493499.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7969329 + 91470096 = 2823^2 + 9564^2 .

It is not a de Polignac number, because 99439425 - 2¹⁰ = 99438401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99439429) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 220752 + ... + 221201.

It is an arithmetic number, because the mean of its divisors is an integer number (9894859).

Almost surely, 2^99439425 is an apocalyptic number.

It is an amenable number.

99439425 is a deficient number, since it is larger than the sum of its proper divisors (78668037).

99439425 is a wasteful number, since it uses less digits than its factorization.

99439425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441969 (or 441961 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 99439425 is about 9971.9318589730. The cubic root of 99439425 is about 463.2899380828.

The spelling of 99439425 in words is "ninety-nine million, four hundred thirty-nine thousand, four hundred twenty-five".