921994799 has 4 divisors (see below), whose sum is σ = 1005812520. Its totient is φ = 838177080.

The previous prime is 921994789. The next prime is 921994807. The reversal of 921994799 is 997499129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921994799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921994739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41908844 + ... + 41908865.

It is an arithmetic number, because the mean of its divisors is an integer number (251453130).

Almost surely, 2^921994799 is an apocalyptic number.

921994799 is a deficient number, since it is larger than the sum of its proper divisors (83817721).

921994799 is a wasteful number, since it uses less digits than its factorization.

921994799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83817720.

The product of its digits is 3306744, while the sum is 59.

The square root of 921994799 is about 30364.3672583507. The cubic root of 921994799 is about 973.2912605222.

The spelling of 921994799 in words is "nine hundred twenty-one million, nine hundred ninety-four thousand, seven hundred ninety-nine".