398831923386 has 80 divisors (see below), whose sum is σ = 962862471648. Its totient is φ = 122661540000.

The previous prime is 398831923351. The next prime is 398831923421. The reversal of 398831923386 is 683329138893.

398831923386 is a `hidden beast` number, since 3 + 9 + 8 + 8 + 319 + 233 + 86 = 666.

It is an interprime number because it is at equal distance from previous prime (398831923351) and next prime (398831923421).

It is a super-2 number, since 2×398831923386² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4698541 + ... + 4782671.

Almost surely, 2^398831923386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398831923386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481431235824).

398831923386 is an abundant number, since it is smaller than the sum of its proper divisors (564030548262).

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

398831923386 is a wasteful number, since it uses less digits than its factorization.

398831923386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86409 (or 86400 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 63.

The spelling of 398831923386 in words is "three hundred ninety-eight billion, eight hundred thirty-one million, nine hundred twenty-three thousand, three hundred eighty-six".