9919980 has 72 divisors (see below), whose sum is σ = 34393632. Its totient is φ = 2267136.

The previous prime is 9919979. The next prime is 9919997. The reversal of 9919980 is 899199.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2677 + ... + 5196.

Almost surely, 2^9919980 is an apocalyptic number.

9919980 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9919980 is an abundant number, since it is smaller than the sum of its proper divisors (24473652).

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

9919980 is a wasteful number, since it uses less digits than its factorization.

9919980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7895 (or 7890 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 9919980 is about 3149.5999745999. The cubic root of 9919980 is about 214.8672697976.

The spelling of 9919980 in words is "nine million, nine hundred nineteen thousand, nine hundred eighty".