239904009 has 24 divisors (see below), whose sum is σ = 366043392. Its totient is φ = 151169760.

The previous prime is 239903981. The next prime is 239904059. The reversal of 239904009 is 900409932.

It is not a de Polignac number, because 239904009 - 2⁵ = 239903977 is a prime.

It is a super-3 number, since 3×239904009³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (239904059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1999 + ... + 21995.

It is an arithmetic number, because the mean of its divisors is an integer number (15251808).

Almost surely, 2^239904009 is an apocalyptic number.

It is an amenable number.

239904009 is a deficient number, since it is larger than the sum of its proper divisors (126139383).

239904009 is a wasteful number, since it uses less digits than its factorization.

239904009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20077 (or 20074 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 239904009 is about 15488.8349787839. The cubic root of 239904009 is about 621.3636383770.

The spelling of 239904009 in words is "two hundred thirty-nine million, nine hundred four thousand, nine".