399203712 has 192 divisors, whose sum is σ = 1201037760. Its totient is φ = 127180800.

The previous prime is 399203711. The next prime is 399203713. The reversal of 399203712 is 217302993.

It is an interprime number because it is at equal distance from previous prime (399203711) and next prime (399203713).

It is a tau number, because it is divible by the number of its divisors (192).

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 (399203711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3952462 + ... + 3952562.

It is an arithmetic number, because the mean of its divisors is an integer number (6255405).

Almost surely, 2^399203712 is an apocalyptic number.

399203712 is a gapful number since it is divisible by the number (32) 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 399203712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (600518880).

399203712 is an abundant number, since it is smaller than the sum of its proper divisors (801834048).

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

399203712 is a wasteful number, since it uses less digits than its factorization.

399203712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 399203712 is about 19980.0828827110. The cubic root of 399203712 is about 736.3170499189.

The spelling of 399203712 in words is "three hundred ninety-nine million, two hundred three thousand, seven hundred twelve".