399081696 has 96 divisors (see below), whose sum is σ = 1141166880. Its totient is φ = 121380864.

The previous prime is 399081691. The next prime is 399081743. The reversal of 399081696 is 696180993.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399081691) 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, 109276 + ... + 112868.

It is an arithmetic number, because the mean of its divisors is an integer number (11887155).

Almost surely, 2^399081696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399081696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (570583440).

399081696 is an abundant number, since it is smaller than the sum of its proper divisors (742085184).

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

399081696 is a wasteful number, since it uses less digits than its factorization.

399081696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708 (or 3700 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 399081696 is about 19977.0292085685. The cubic root of 399081696 is about 736.2420242169.

The spelling of 399081696 in words is "three hundred ninety-nine million, eighty-one thousand, six hundred ninety-six".