399712065 has 16 divisors (see below), whose sum is σ = 641729088. Its totient is φ = 212449856.

The previous prime is 399712057. The next prime is 399712069. The reversal of 399712065 is 560217993.

It is a cyclic number.

It is not a de Polignac number, because 399712065 - 2³ = 399712057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399712069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41079 + ... + 49868.

It is an arithmetic number, because the mean of its divisors is an integer number (40108068).

Almost surely, 2^399712065 is an apocalyptic number.

It is an amenable number.

399712065 is a deficient number, since it is larger than the sum of its proper divisors (242017023).

399712065 is a wasteful number, since it uses less digits than its factorization.

399712065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91248.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 399712065 is about 19992.8003291185. The cubic root of 399712065 is about 736.6294636886.

The spelling of 399712065 in words is "three hundred ninety-nine million, seven hundred twelve thousand, sixty-five".