399968946 has 24 divisors (see below), whose sum is σ = 933261420. Its totient is φ = 123067296.

The previous prime is 399968939. The next prime is 399968963. The reversal of 399968946 is 649869993.

It can be written as a sum of positive squares in 2 ways, for example, as 399800025 + 168921 = 19995^2 + 411^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 854401 + ... + 854868.

Almost surely, 2^399968946 is an apocalyptic number.

399968946 is an abundant number, since it is smaller than the sum of its proper divisors (533292474).

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

399968946 is a wasteful number, since it uses less digits than its factorization.

399968946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709290 (or 1709287 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 63.

The square root of 399968946 is about 19999.2236349314. The cubic root of 399968946 is about 736.7872319156.

The spelling of 399968946 in words is "three hundred ninety-nine million, nine hundred sixty-eight thousand, nine hundred forty-six".