399789936 has 120 divisors (see below), whose sum is σ = 1377099360. Its totient is φ = 105435648.

The previous prime is 399789917. The next prime is 399789941. The reversal of 399789936 is 639987993.

It is a Harshad number since it is a multiple of its sum of digits (63).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2151 + ... + 28358.

It is an arithmetic number, because the mean of its divisors is an integer number (11475828).

Almost surely, 2^399789936 is an apocalyptic number.

399789936 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 399789936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688549680).

399789936 is an abundant number, since it is smaller than the sum of its proper divisors (977309424).

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

399789936 is a wasteful number, since it uses less digits than its factorization.

399789936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30543 (or 30534 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 63.

The square root of 399789936 is about 19994.7477103363. The cubic root of 399789936 is about 736.6772967443.

The spelling of 399789936 in words is "three hundred ninety-nine million, seven hundred eighty-nine thousand, nine hundred thirty-six".