399272209 has 8 divisors (see below), whose sum is σ = 458861760. Its totient is φ = 340320336.

The previous prime is 399272201. The next prime is 399272221. The reversal of 399272209 is 902272993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399272209 - 2³ = 399272201 is a prime.

It is a super-3 number, since 3×399272209³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (399272201) 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, 158074 + ... + 160579.

It is an arithmetic number, because the mean of its divisors is an integer number (57357720).

Almost surely, 2^399272209 is an apocalyptic number.

It is an amenable number.

399272209 is a deficient number, since it is larger than the sum of its proper divisors (59589551).

399272209 is a wasteful number, since it uses less digits than its factorization.

399272209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318839.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 399272209 is about 19981.7969412163. The cubic root of 399272209 is about 736.3591609373.

The spelling of 399272209 in words is "three hundred ninety-nine million, two hundred seventy-two thousand, two hundred nine".