399811998 has 16 divisors (see below), whose sum is σ = 804992400. Its totient is φ = 132375936.

The previous prime is 399811943. The next prime is 399811999. The reversal of 399811998 is 899118993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399811999) 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, 222715 + ... + 224502.

It is an arithmetic number, because the mean of its divisors is an integer number (50312025).

Almost surely, 2^399811998 is an apocalyptic number.

399811998 is an abundant number, since it is smaller than the sum of its proper divisors (405180402).

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

399811998 is a wasteful number, since it uses less digits than its factorization.

399811998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447371.

The product of its digits is 1259712, while the sum is 57.

The square root of 399811998 is about 19995.2993976084. The cubic root of 399811998 is about 736.6908474235.

The spelling of 399811998 in words is "three hundred ninety-nine million, eight hundred eleven thousand, nine hundred ninety-eight".