938398440 has 256 divisors, whose sum is σ = 3346675200. Its totient is φ = 206032896.

The previous prime is 938398411. The next prime is 938398451. The reversal of 938398440 is 44893839.

It is a self number, because there is not a number n which added to its sum of digits gives 938398440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3387582 + ... + 3387858.

It is an arithmetic number, because the mean of its divisors is an integer number (13072950).

Almost surely, 2^938398440 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 938398440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1673337600).

938398440 is an abundant number, since it is smaller than the sum of its proper divisors (2408276760).

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

938398440 is a wasteful number, since it uses less digits than its factorization.

938398440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 938398440 is about 30633.2897351884. The cubic root of 938398440 is about 979.0294570215.

The spelling of 938398440 in words is "nine hundred thirty-eight million, three hundred ninety-eight thousand, four hundred forty".