399949696 has 64 divisors (see below), whose sum is σ = 856800000. Its totient is φ = 185366016.

The previous prime is 399949679. The next prime is 399949729. The reversal of 399949696 is 696949993.

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 (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112555 + ... + 116053.

It is an arithmetic number, because the mean of its divisors is an integer number (13387500).

Almost surely, 2^399949696 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 399949696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428400000).

399949696 is an abundant number, since it is smaller than the sum of its proper divisors (456850304).

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

399949696 is a wasteful number, since it uses less digits than its factorization.

399949696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579 (or 3567 counting only the distinct ones).

The product of its digits is 25509168, while the sum is 64.

The square root of 399949696 is about 19998.7423604586. The cubic root of 399949696 is about 736.7754115131.

The spelling of 399949696 in words is "three hundred ninety-nine million, nine hundred forty-nine thousand, six hundred ninety-six".