9978090 has 32 divisors (see below), whose sum is σ = 24990336. Its totient is φ = 2544960.

The previous prime is 9978079. The next prime is 9978103. The reversal of 9978090 is 908799.

It is a happy number.

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, 6541 + ... + 7920.

It is an arithmetic number, because the mean of its divisors is an integer number (780948).

Almost surely, 2^9978090 is an apocalyptic number.

9978090 is an abundant number, since it is smaller than the sum of its proper divisors (15012246).

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

9978090 is a wasteful number, since it uses less digits than its factorization.

9978090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14494.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 9978090 is about 3158.8114853533. The cubic root of 9978090 is about 215.2860084015.

The spelling of 9978090 in words is "nine million, nine hundred seventy-eight thousand, ninety".