399677616 has 240 divisors, whose sum is σ = 1344601440. Its totient is φ = 109486080.

The previous prime is 399677609. The next prime is 399677617. The reversal of 399677616 is 616776993.

It is not an unprimeable number, because it can be changed into a prime (399677617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 604326 + ... + 604986.

It is an arithmetic number, because the mean of its divisors is an integer number (5602506).

Almost surely, 2^399677616 is an apocalyptic number.

399677616 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399677616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672300720).

399677616 is an abundant number, since it is smaller than the sum of its proper divisors (944923824).

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

399677616 is a wasteful number, since it uses less digits than its factorization.

399677616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 715 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 54.

The square root of 399677616 is about 19991.9387754165. The cubic root of 399677616 is about 736.6083010571.

The spelling of 399677616 in words is "three hundred ninety-nine million, six hundred seventy-seven thousand, six hundred sixteen".