398996220 has 144 divisors (see below), whose sum is σ = 1312180128. Its totient is φ = 90316800.

The previous prime is 398996159. The next prime is 398996231. The reversal of 398996220 is 22699893.

It is a self number, because there is not a number n which added to its sum of digits gives 398996220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 331620 + ... + 332820.

It is an arithmetic number, because the mean of its divisors is an integer number (9112362).

Almost surely, 2^398996220 is an apocalyptic number.

398996220 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 398996220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (656090064).

398996220 is an abundant number, since it is smaller than the sum of its proper divisors (913183908).

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

398996220 is a wasteful number, since it uses less digits than its factorization.

398996220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 398996220 is about 19974.8897368671. The cubic root of 398996220 is about 736.1894572719.

The spelling of 398996220 in words is "three hundred ninety-eight million, nine hundred ninety-six thousand, two hundred twenty".