399890000 has 50 divisors (see below), whose sum is σ = 968197890. Its totient is φ = 159952000.

The previous prime is 399889993. The next prime is 399890003. The reversal of 399890000 is 98993.

It can be written as a sum of positive squares in 5 ways, for example, as 232135696 + 167754304 = 15236^2 + 12952^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399890003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9995 + ... + 29994.

Almost surely, 2^399890000 is an apocalyptic number.

It is an amenable number.

399890000 is an abundant number, since it is smaller than the sum of its proper divisors (568307890).

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

399890000 is an equidigital number, since it uses as much as digits as its factorization.

399890000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40017 (or 39996 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 399890000 is about 19997.2498109115. The cubic root of 399890000 is about 736.7387529584.

The spelling of 399890000 in words is "three hundred ninety-nine million, eight hundred ninety thousand".