398020220 has 24 divisors (see below), whose sum is σ = 900138624. Its totient is φ = 146961216.

The previous prime is 398020213. The next prime is 398020223. The reversal of 398020220 is 22020893.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 398020220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398020223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 765164 + ... + 765683.

It is an arithmetic number, because the mean of its divisors is an integer number (37505776).

Almost surely, 2^398020220 is an apocalyptic number.

It is an amenable number.

398020220 is an abundant number, since it is smaller than the sum of its proper divisors (502118404).

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

398020220 is a wasteful number, since it uses less digits than its factorization.

398020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530869 (or 1530867 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 398020220 is about 19950.4441053326. Note that the first 3 decimals coincide. The cubic root of 398020220 is about 735.5886933725.

The spelling of 398020220 in words is "three hundred ninety-eight million, twenty thousand, two hundred twenty".