9999378 has 12 divisors (see below), whose sum is σ = 21665358. Its totient is φ = 3333120.

The previous prime is 9999347. The next prime is 9999397. The reversal of 9999378 is 8739999.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6185169 + 3814209 = 2487^2 + 1953^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 277743 + ... + 277778.

Almost surely, 2^9999378 is an apocalyptic number.

9999378 is an abundant number, since it is smaller than the sum of its proper divisors (11665980).

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

9999378 is a wasteful number, since it uses less digits than its factorization.

9999378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555529 (or 555526 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 9999378 is about 3162.1793118038. The cubic root of 9999378 is about 215.4390020493.

The spelling of 9999378 in words is "nine million, nine hundred ninety-nine thousand, three hundred seventy-eight".