99940239 has 24 divisors (see below), whose sum is σ = 167311872. Its totient is φ = 56301840.

The previous prime is 99940231. The next prime is 99940241. The reversal of 99940239 is 93204999.

It is not a de Polignac number, because 99940239 - 2³ = 99940231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99940194 and 99940203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99940231) 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 23 ways as a sum of consecutive naturals, for example, 6699 + ... + 15644.

It is an arithmetic number, because the mean of its divisors is an integer number (6971328).

Almost surely, 2^99940239 is an apocalyptic number.

99940239 is a deficient number, since it is larger than the sum of its proper divisors (67371633).

99940239 is a wasteful number, since it uses less digits than its factorization.

99940239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22427 (or 22424 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 99940239 is about 9997.0115034444. The cubic root of 99940239 is about 464.0664029397.

The spelling of 99940239 in words is "ninety-nine million, nine hundred forty thousand, two hundred thirty-nine".