921990769 has 8 divisors (see below), whose sum is σ = 1053890240. Its totient is φ = 790137936.

The previous prime is 921990737. The next prime is 921990781. The reversal of 921990769 is 967099129.

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

It is not a de Polignac number, because 921990769 - 2⁵ = 921990737 is a prime.

It is a super-2 number, since 2×921990769² = 1700133956242422722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921990269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60487 + ... + 74179.

It is an arithmetic number, because the mean of its divisors is an integer number (131736280).

Almost surely, 2^921990769 is an apocalyptic number.

It is an amenable number.

921990769 is a deficient number, since it is larger than the sum of its proper divisors (131899471).

921990769 is a wasteful number, since it uses less digits than its factorization.

921990769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23319.

The product of its (nonzero) digits is 551124, while the sum is 52.

The square root of 921990769 is about 30364.3008976001. The cubic root of 921990769 is about 973.2898424485.

The spelling of 921990769 in words is "nine hundred twenty-one million, nine hundred ninety thousand, seven hundred sixty-nine".