398689874550 has 192 divisors, whose sum is σ = 1199060755200. Its totient is φ = 96605740800.

The previous prime is 398689874549. The next prime is 398689874591. The reversal of 398689874550 is 55478986893.

398689874550 is a `hidden beast` number, since 3 + 9 + 8 + 68 + 9 + 8 + 7 + 4 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 38857321 + ... + 38867579.

It is an arithmetic number, because the mean of its divisors is an integer number (6245108100).

Almost surely, 2^398689874550 is an apocalyptic number.

398689874550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398689874550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (599530377600).

398689874550 is an abundant number, since it is smaller than the sum of its proper divisors (800370880650).

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

398689874550 is a wasteful number, since it uses less digits than its factorization.

398689874550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12908 (or 12897 counting only the distinct ones).

The product of its (nonzero) digits is 522547200, while the sum is 72.

The spelling of 398689874550 in words is "three hundred ninety-eight billion, six hundred eighty-nine million, eight hundred seventy-four thousand, five hundred fifty".