399106620 has 288 divisors, whose sum is σ = 1426553856. Its totient is φ = 89241600.

The previous prime is 399106577. The next prime is 399106627. The reversal of 399106620 is 26601993.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399106627) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2389777 + ... + 2389943.

It is an arithmetic number, because the mean of its divisors is an integer number (4953312).

Almost surely, 2^399106620 is an apocalyptic number.

399106620 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 399106620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713276928).

399106620 is an abundant number, since it is smaller than the sum of its proper divisors (1027447236).

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

399106620 is a wasteful number, since it uses less digits than its factorization.

399106620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 399106620 is about 19977.6530153069. The cubic root of 399106620 is about 736.2573508317.

The spelling of 399106620 in words is "three hundred ninety-nine million, one hundred six thousand, six hundred twenty".