398889129646 has 16 divisors (see below), whose sum is σ = 707389590240. Its totient is φ = 165057570720.

The previous prime is 398889129593. The next prime is 398889129647. The reversal of 398889129646 is 646921988893.

It is a super-2 number, since 2×398889129646² (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 (398889129647) 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 7 ways as a sum of consecutive naturals, for example, 491242365 + ... + 491243176.

It is an arithmetic number, because the mean of its divisors is an integer number (44211849390).

Almost surely, 2^398889129646 is an apocalyptic number.

398889129646 is a deficient number, since it is larger than the sum of its proper divisors (308500460594).

398889129646 is a wasteful number, since it uses less digits than its factorization.

398889129646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982485579.

The product of its digits is 322486272, while the sum is 73.

The spelling of 398889129646 in words is "three hundred ninety-eight billion, eight hundred eighty-nine million, one hundred twenty-nine thousand, six hundred forty-six".