399893910 has 128 divisors (see below), whose sum is σ = 1074487680. Its totient is φ = 94617600.

The previous prime is 399893909. The next prime is 399893911. The reversal of 399893910 is 19398993.

It is an interprime number because it is at equal distance from previous prime (399893909) and next prime (399893911).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399893911) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1422970 + ... + 1423250.

It is an arithmetic number, because the mean of its divisors is an integer number (8394435).

Almost surely, 2^399893910 is an apocalyptic number.

399893910 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 399893910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (537243840).

399893910 is an abundant number, since it is smaller than the sum of its proper divisors (674593770).

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

399893910 is a wasteful number, since it uses less digits than its factorization.

399893910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434.

The product of its (nonzero) digits is 472392, while the sum is 51.

The square root of 399893910 is about 19997.3475741159. The cubic root of 399893910 is about 736.7411541514.

The spelling of 399893910 in words is "three hundred ninety-nine million, eight hundred ninety-three thousand, nine hundred ten".