399687288 has 256 divisors, whose sum is σ = 1362493440. Its totient is φ = 94348800.

The previous prime is 399687241. The next prime is 399687313. The reversal of 399687288 is 882786993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3050983 + ... + 3051113.

It is an arithmetic number, because the mean of its divisors is an integer number (5322240).

Almost surely, 2^399687288 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 399687288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681246720).

399687288 is an abundant number, since it is smaller than the sum of its proper divisors (962806152).

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

399687288 is a wasteful number, since it uses less digits than its factorization.

399687288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 294 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The square root of 399687288 is about 19992.1806714525. The cubic root of 399687288 is about 736.6142428610.

The spelling of 399687288 in words is "three hundred ninety-nine million, six hundred eighty-seven thousand, two hundred eighty-eight".