398687503734 has 128 divisors (see below), whose sum is σ = 1024479912960. Its totient is φ = 113830617600.

The previous prime is 398687503733. The next prime is 398687503793. The reversal of 398687503734 is 437305786893.

398687503734 is a `hidden beast` number, since 3 + 98 + 6 + 8 + 7 + 503 + 7 + 34 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398687503733) 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 63 ways as a sum of consecutive naturals, for example, 612049 + ... + 1082579.

It is an arithmetic number, because the mean of its divisors is an integer number (8003749320).

Almost surely, 2^398687503734 is an apocalyptic number.

398687503734 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398687503734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512239956480).

398687503734 is an abundant number, since it is smaller than the sum of its proper divisors (625792409226).

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

398687503734 is a wasteful number, since it uses less digits than its factorization.

398687503734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470643 (or 470637 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 63.

The spelling of 398687503734 in words is "three hundred ninety-eight billion, six hundred eighty-seven million, five hundred three thousand, seven hundred thirty-four".