9919642867 has 8 divisors (see below), whose sum is σ = 10162701824. Its totient is φ = 9677146248.

The previous prime is 9919642861. The next prime is 9919642891. The reversal of 9919642867 is 7682469199.

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

It is a cyclic number.

It is not a de Polignac number, because 9919642867 - 2¹⁹ = 9919118579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9919642861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104763 + ... + 175540.

It is an arithmetic number, because the mean of its divisors is an integer number (1270337728).

Almost surely, 2^9919642867 is an apocalyptic number.

9919642867 is a deficient number, since it is larger than the sum of its proper divisors (243058957).

9919642867 is a wasteful number, since it uses less digits than its factorization.

9919642867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281169.

The product of its digits is 11757312, while the sum is 61.

The square root of 9919642867 is about 99597.4039169696. The cubic root of 9919642867 is about 2148.6483566402.

The spelling of 9919642867 in words is "nine billion, nine hundred nineteen million, six hundred forty-two thousand, eight hundred sixty-seven".