398111780 has 72 divisors (see below), whose sum is σ = 973103544. Its totient is φ = 136238080.

The previous prime is 398111773. The next prime is 398111783. The reversal of 398111780 is 87111893.

It can be written as a sum of positive squares in 4 ways, for example, as 113379904 + 284731876 = 10648^2 + 16874^2 .

It is not an unprimeable number, because it can be changed into a prime (398111783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36302 + ... + 45978.

It is an arithmetic number, because the mean of its divisors is an integer number (13515327).

Almost surely, 2^398111780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398111780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486551772).

398111780 is an abundant number, since it is smaller than the sum of its proper divisors (574991764).

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

398111780 is a wasteful number, since it uses less digits than its factorization.

398111780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9725 (or 9712 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 398111780 is about 19952.7386591415. The cubic root of 398111780 is about 735.6450936369.

The spelling of 398111780 in words is "three hundred ninety-eight million, one hundred eleven thousand, seven hundred eighty".