239909121 has 15 divisors (see below), whose sum is σ = 358591123. Its totient is φ = 159846480.

The previous prime is 239909101. The next prime is 239909123. The reversal of 239909121 is 121909932.

It is a happy number.

The square root of 239909121 is 15489.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 177182721 + 62726400 = 13311^2 + 7920^2 .

It is not a de Polignac number, because 239909121 - 2⁹ = 239908609 is a prime.

It is a super-3 number, since 3×239909121³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239909123) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 138541 + ... + 140261.

Almost surely, 2^239909121 is an apocalyptic number.

239909121 is the 15489-th square number.

239909121 is the 7745-th centered octagonal number.

It is an amenable number.

239909121 is a deficient number, since it is larger than the sum of its proper divisors (118682002).

239909121 is an frugal number, since it uses more digits than its factorization.

239909121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The cubic root of 239909121 is about 621.3680517927.

Multiplying 239909121 by its sum of digits (36), we get a square (8636728356 = 92934²).

The spelling of 239909121 in words is "two hundred thirty-nine million, nine hundred nine thousand, one hundred twenty-one".