399824440 has 16 divisors (see below), whose sum is σ = 899605080. Its totient is φ = 159929760.

The previous prime is 399824423. The next prime is 399824471. The reversal of 399824440 is 44428993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4997766 + ... + 4997845.

Almost surely, 2^399824440 is an apocalyptic number.

It is an amenable number.

399824440 is an abundant number, since it is smaller than the sum of its proper divisors (499780640).

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

399824440 is a wasteful number, since it uses less digits than its factorization.

399824440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9995622 (or 9995618 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 399824440 is about 19995.6105183113. The cubic root of 399824440 is about 736.6984891922.

The spelling of 399824440 in words is "three hundred ninety-nine million, eight hundred twenty-four thousand, four hundred forty".