399898985 has 8 divisors (see below), whose sum is σ = 505135680. Its totient is φ = 303081264.

The previous prime is 399898963. The next prime is 399899029. The reversal of 399898985 is 589898993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399898985 - 2⁶ = 399898921 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2104637 + ... + 2104826.

It is an arithmetic number, because the mean of its divisors is an integer number (63141960).

Almost surely, 2^399898985 is an apocalyptic number.

It is an amenable number.

399898985 is a deficient number, since it is larger than the sum of its proper divisors (105236695).

399898985 is a wasteful number, since it uses less digits than its factorization.

399898985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209487.

The product of its digits is 50388480, while the sum is 68.

The square root of 399898985 is about 19997.4744655419. The cubic root of 399898985 is about 736.7442707659.

The spelling of 399898985 in words is "three hundred ninety-nine million, eight hundred ninety-eight thousand, nine hundred eighty-five".