398997504 has 72 divisors (see below), whose sum is σ = 1152431280. Its totient is φ = 132993024.

The previous prime is 398997503. The next prime is 398997539. The reversal of 398997504 is 405799893.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398997503) 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, 7609 + ... + 29255.

It is an arithmetic number, because the mean of its divisors is an integer number (16005990).

Almost surely, 2^398997504 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 398997504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (576215640).

398997504 is an abundant number, since it is smaller than the sum of its proper divisors (753433776).

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

398997504 is a wasteful number, since it uses less digits than its factorization.

398997504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21675 (or 21652 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 398997504 is about 19974.9218771939. The cubic root of 398997504 is about 736.1902469755.

The spelling of 398997504 in words is "three hundred ninety-eight million, nine hundred ninety-seven thousand, five hundred four".