9915912378 has 32 divisors (see below), whose sum is σ = 22088001600. Its totient is φ = 3297408048.

The previous prime is 9915912367. The next prime is 9915912389. The reversal of 9915912378 is 8732195199.

It is an interprime number because it is at equal distance from previous prime (9915912367) and next prime (9915912389).

It is a super-2 number, since 2×9915912378² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196501 + ... + 241752.

It is an arithmetic number, because the mean of its divisors is an integer number (690250050).

Almost surely, 2^9915912378 is an apocalyptic number.

9915912378 is an abundant number, since it is smaller than the sum of its proper divisors (12172089222).

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

9915912378 is a wasteful number, since it uses less digits than its factorization.

9915912378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438683 (or 438677 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 9915912378 is about 99578.6743133288. The cubic root of 9915912378 is about 2148.3789748296.

The spelling of 9915912378 in words is "nine billion, nine hundred fifteen million, nine hundred twelve thousand, three hundred seventy-eight".