399198894 has 16 divisors (see below), whose sum is σ = 809335632. Its totient is φ = 131243328.

The previous prime is 399198893. The next prime is 399198901. The reversal of 399198894 is 498891993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399198893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455269 + ... + 456144.

It is an arithmetic number, because the mean of its divisors is an integer number (50583477).

Almost surely, 2^399198894 is an apocalyptic number.

399198894 is an abundant number, since it is smaller than the sum of its proper divisors (410136738).

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

399198894 is a wasteful number, since it uses less digits than its factorization.

399198894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911491.

The product of its digits is 5038848, while the sum is 60.

The square root of 399198894 is about 19979.9623122768. The cubic root of 399198894 is about 736.3140876971.

The spelling of 399198894 in words is "three hundred ninety-nine million, one hundred ninety-eight thousand, eight hundred ninety-four".