398986586438 has 16 divisors (see below), whose sum is σ = 652905244224. Its totient is φ = 181352510760.

The previous prime is 398986586431. The next prime is 398986586461. The reversal of 398986586438 is 834685689893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398986586431) by changing a digit.

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, 628481 + ... + 1092227.

It is an arithmetic number, because the mean of its divisors is an integer number (40806577764).

Almost surely, 2^398986586438 is an apocalyptic number.

398986586438 is a deficient number, since it is larger than the sum of its proper divisors (253918657786).

398986586438 is a wasteful number, since it uses less digits than its factorization.

398986586438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502867.

The product of its digits is 2149908480, while the sum is 77.

The spelling of 398986586438 in words is "three hundred ninety-eight billion, nine hundred eighty-six million, five hundred eighty-six thousand, four hundred thirty-eight".