997875378 has 48 divisors (see below), whose sum is σ = 2294360640. Its totient is φ = 312762912.

The previous prime is 997875331. The next prime is 997875397. The reversal of 997875378 is 873578799.

997875378 is a `hidden beast` number, since 9 + 97 + 8 + 7 + 537 + 8 = 666.

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 23 ways as a sum of consecutive naturals, for example, 4000 + ... + 44852.

It is an arithmetic number, because the mean of its divisors is an integer number (47799180).

Almost surely, 2^997875378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997875378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1147180320).

997875378 is an abundant number, since it is smaller than the sum of its proper divisors (1296485262).

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

997875378 is a wasteful number, since it uses less digits than its factorization.

997875378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40943 (or 40940 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 63.

The square root of 997875378 is about 31589.1655160436. The cubic root of 997875378 is about 999.2912905162.

The spelling of 997875378 in words is "nine hundred ninety-seven million, eight hundred seventy-five thousand, three hundred seventy-eight".