398539440 has 480 divisors, whose sum is σ = 1592398080. Its totient is φ = 91819008.

The previous prime is 398539399. The next prime is 398539499. The reversal of 398539440 is 44935893.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4801639 + ... + 4801721.

It is an arithmetic number, because the mean of its divisors is an integer number (3317496).

Almost surely, 2^398539440 is an apocalyptic number.

398539440 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 398539440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796199040).

398539440 is an abundant number, since it is smaller than the sum of its proper divisors (1193858640).

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

398539440 is a wasteful number, since it uses less digits than its factorization.

398539440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 398539440 is about 19963.4526072020. The cubic root of 398539440 is about 735.9084144860.

The spelling of 398539440 in words is "three hundred ninety-eight million, five hundred thirty-nine thousand, four hundred forty".