399999996 has 144 divisors (see below), whose sum is σ = 1137453408. Its totient is φ = 117504000.

The previous prime is 399999959. The next prime is 400000009. The reversal of 399999996 is 699999993.

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

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 2919640 + ... + 2919776.

It is an arithmetic number, because the mean of its divisors is an integer number (7898982).

Almost surely, 2^399999996 is an apocalyptic number.

399999996 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 399999996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (568726704).

399999996 is an abundant number, since it is smaller than the sum of its proper divisors (737453412).

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

399999996 is a wasteful number, since it uses less digits than its factorization.

399999996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 327 counting only the distinct ones).

The product of its digits is 86093442, while the sum is 72.

The square root of 399999996 is about 19999.9999000000. Note that the first 4 decimals coincide. The cubic root of 399999996 is about 736.8062972721.

It can be divided in two parts, 3 and 99999996, that added together give a palindrome (99999999).

The spelling of 399999996 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-six".