398770685820 has 384 divisors, whose sum is σ = 1351500595200. Its totient is φ = 97030047744.

The previous prime is 398770685809. The next prime is 398770685837. The reversal of 398770685820 is 28586077893.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 309363736 + ... + 309365024.

It is an arithmetic number, because the mean of its divisors is an integer number (3519532800).

Almost surely, 2^398770685820 is an apocalyptic number.

398770685820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398770685820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (675750297600).

398770685820 is an abundant number, since it is smaller than the sum of its proper divisors (952729909380).

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

398770685820 is a wasteful number, since it uses less digits than its factorization.

398770685820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 398770685820 in words is "three hundred ninety-eight billion, seven hundred seventy million, six hundred eighty-five thousand, eight hundred twenty".