399648907 has 16 divisors (see below), whose sum is σ = 481340160. Its totient is φ = 324149472.

The previous prime is 399648889. The next prime is 399648919. The reversal of 399648907 is 709846993.

It is a cyclic number.

It is not a de Polignac number, because 399648907 - 2¹⁹ = 399124619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399648947) 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, 201573 + ... + 203545.

It is an arithmetic number, because the mean of its divisors is an integer number (30083760).

Almost surely, 2^399648907 is an apocalyptic number.

399648907 is a deficient number, since it is larger than the sum of its proper divisors (81691253).

399648907 is a wasteful number, since it uses less digits than its factorization.

399648907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 399648907 is about 19991.2207481184. The cubic root of 399648907 is about 736.5906636804.

The spelling of 399648907 in words is "three hundred ninety-nine million, six hundred forty-eight thousand, nine hundred seven".