398985394997 has 16 divisors (see below), whose sum is σ = 457877347200. Its totient is φ = 340567416000.

The previous prime is 398985394991. The next prime is 398985395069. The reversal of 398985394997 is 799493589893.

It is not a de Polignac number, because 398985394997 - 2¹² = 398985390901 is a prime.

It is a super-2 number, since 2×398985394997² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398985394991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12826379 + ... + 12857447.

It is an arithmetic number, because the mean of its divisors is an integer number (28617334200).

Almost surely, 2^398985394997 is an apocalyptic number.

It is an amenable number.

398985394997 is a deficient number, since it is larger than the sum of its proper divisors (58891952203).

398985394997 is a wasteful number, since it uses less digits than its factorization.

398985394997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38636.

The product of its digits is 4761711360, while the sum is 83.

The spelling of 398985394997 in words is "three hundred ninety-eight billion, nine hundred eighty-five million, three hundred ninety-four thousand, nine hundred ninety-seven".