399619839816 has 64 divisors (see below), whose sum is σ = 1128869640000. Its totient is φ = 130948869888.

The previous prime is 399619839809. The next prime is 399619839823. The reversal of 399619839816 is 618938916993.

399619839816 is a `hidden beast` number, since 3 + 99 + 61 + 98 + 398 + 1 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (399619839809) and next prime (399619839823).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15666001 + ... + 15691488.

It is an arithmetic number, because the mean of its divisors is an integer number (17638588125).

Almost surely, 2^399619839816 is an apocalyptic number.

399619839816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399619839816 is an abundant number, since it is smaller than the sum of its proper divisors (729249800184).

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

399619839816 is a wasteful number, since it uses less digits than its factorization.

399619839816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31357563 (or 31357553 counting only the distinct ones).

The product of its digits is 136048896, while the sum is 72.

The spelling of 399619839816 in words is "three hundred ninety-nine billion, six hundred nineteen million, eight hundred thirty-nine thousand, eight hundred sixteen".