399969024 has 288 divisors, whose sum is σ = 1346096640. Its totient is φ = 102629376.

The previous prime is 399969023. The next prime is 399969041. The reversal of 399969024 is 420969993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399969023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4123344 + ... + 4123440.

Almost surely, 2^399969024 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 399969024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673048320).

399969024 is an abundant number, since it is smaller than the sum of its proper divisors (946127616).

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

399969024 is a wasteful number, since it uses less digits than its factorization.

399969024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 51.

The square root of 399969024 is about 19999.2255850070. The cubic root of 399969024 is about 736.7872798105.

The spelling of 399969024 in words is "three hundred ninety-nine million, nine hundred sixty-nine thousand, twenty-four".