399213696 has 64 divisors (see below), whose sum is σ = 1211906880. Its totient is φ = 114060288.

The previous prime is 399213673. The next prime is 399213719. The reversal of 399213696 is 696312993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399213673) and next prime (399213719).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71571 + ... + 76946.

It is an arithmetic number, because the mean of its divisors is an integer number (18936045).

Almost surely, 2^399213696 is an apocalyptic number.

It is an amenable number.

399213696 is an abundant number, since it is smaller than the sum of its proper divisors (812693184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399213696 is a wasteful number, since it uses less digits than its factorization.

399213696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148541 (or 148529 counting only the distinct ones).

The product of its digits is 472392, while the sum is 48.

The square root of 399213696 is about 19980.3327299622. The cubic root of 399213696 is about 736.3231882453.

The spelling of 399213696 in words is "three hundred ninety-nine million, two hundred thirteen thousand, six hundred ninety-six".