399920010 has 64 divisors (see below), whose sum is σ = 1103155200. Its totient is φ = 90891072.

The previous prime is 399920009. The next prime is 399920029. The reversal of 399920010 is 10029993.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32271 + ... + 42909.

It is an arithmetic number, because the mean of its divisors is an integer number (17236800).

Almost surely, 2^399920010 is an apocalyptic number.

399920010 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 399920010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (551577600).

399920010 is an abundant number, since it is smaller than the sum of its proper divisors (703235190).

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

399920010 is a wasteful number, since it uses less digits than its factorization.

399920010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10835.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 399920010 is about 19998.0001500150. Note that the first 3 decimals coincide. The cubic root of 399920010 is about 736.7571821739.

The spelling of 399920010 in words is "three hundred ninety-nine million, nine hundred twenty thousand, ten".