399789120 has 112 divisors (see below), whose sum is σ = 1290328128. Its totient is φ = 104847360.

The previous prime is 399789101. The next prime is 399789121. The reversal of 399789120 is 21987993.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 399789120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399789121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55147 + ... + 61973.

Almost surely, 2^399789120 is an apocalyptic number.

399789120 is a gapful number since it is divisible by the number (30) 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 399789120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645164064).

399789120 is an abundant number, since it is smaller than the sum of its proper divisors (890539008).

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

399789120 is a wasteful number, since it uses less digits than its factorization.

399789120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6908 (or 6898 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 399789120 is about 19994.7273049672. The cubic root of 399789120 is about 736.6767955401.

The spelling of 399789120 in words is "three hundred ninety-nine million, seven hundred eighty-nine thousand, one hundred twenty".