399691100 has 18 divisors (see below), whose sum is σ = 867329904. Its totient is φ = 159876400.

The previous prime is 399691081. The next prime is 399691129. The reversal of 399691100 is 1196993.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1998356 + ... + 1998555.

Almost surely, 2^399691100 is an apocalyptic number.

It is an amenable number.

399691100 is an abundant number, since it is smaller than the sum of its proper divisors (467638804).

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

399691100 is a wasteful number, since it uses less digits than its factorization.

399691100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996925 (or 3996918 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 399691100 is about 19992.2760084989. The cubic root of 399691100 is about 736.6165846622.

The spelling of 399691100 in words is "three hundred ninety-nine million, six hundred ninety-one thousand, one hundred".