9920787 has 8 divisors (see below), whose sum is σ = 13255104. Its totient is φ = 6600168.

The previous prime is 9920783. The next prime is 9920803. The reversal of 9920787 is 7870299.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9920787 - 2² = 9920783 is a prime.

9920787 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9920783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1593 + ... + 4730.

It is an arithmetic number, because the mean of its divisors is an integer number (1656888).

Almost surely, 2^9920787 is an apocalyptic number.

9920787 is a deficient number, since it is larger than the sum of its proper divisors (3334317).

9920787 is a wasteful number, since it uses less digits than its factorization.

9920787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6849.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 9920787 is about 3149.7280835018. The cubic root of 9920787 is about 214.8730961932.

The spelling of 9920787 in words is "nine million, nine hundred twenty thousand, seven hundred eighty-seven".