398980401620 has 18 divisors (see below), whose sum is σ = 837864775566. Its totient is φ = 159591030720.

The previous prime is 398980401593. The next prime is 398980401623. The reversal of 398980401620 is 26104089893.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 199919871376 + 199060530244 = 447124^2 + 446162^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398980401623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2754200 + ... + 2895440.

It is an arithmetic number, because the mean of its divisors is an integer number (46548043087).

Almost surely, 2^398980401620 is an apocalyptic number.

It is an amenable number.

398980401620 is an abundant number, since it is smaller than the sum of its proper divisors (438884373946).

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

398980401620 is an frugal number, since it uses more digits than its factorization.

398980401620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282491 (or 141248 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 398980401620 in words is "three hundred ninety-eight billion, nine hundred eighty million, four hundred one thousand, six hundred twenty".