398421504 has 200 divisors, whose sum is σ = 1282391880. Its totient is φ = 122425344.

The previous prime is 398421493. The next prime is 398421509. The reversal of 398421504 is 405124893.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398421509) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 538767 + ... + 539505.

Almost surely, 2^398421504 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 398421504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (641195940).

398421504 is an abundant number, since it is smaller than the sum of its proper divisors (883970376).

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

398421504 is an equidigital number, since it uses as much as digits as its factorization.

398421504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 398421504 is about 19960.4985909671. The cubic root of 398421504 is about 735.8358171900.

The spelling of 398421504 in words is "three hundred ninety-eight million, four hundred twenty-one thousand, five hundred four".