399825016 has 8 divisors (see below), whose sum is σ = 749671920. Its totient is φ = 199912504.

The previous prime is 399824993. The next prime is 399825017. The reversal of 399825016 is 610528993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399825017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24989056 + ... + 24989071.

It is an arithmetic number, because the mean of its divisors is an integer number (93708990).

Almost surely, 2^399825016 is an apocalyptic number.

It is an amenable number.

399825016 is a deficient number, since it is larger than the sum of its proper divisors (349846904).

399825016 is a wasteful number, since it uses less digits than its factorization.

399825016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49978133 (or 49978129 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 399825016 is about 19995.6249214672. The cubic root of 399825016 is about 736.6988429626.

The spelling of 399825016 in words is "three hundred ninety-nine million, eight hundred twenty-five thousand, sixteen".