769991 has 4 divisors (see below), whose sum is σ = 779352. Its totient is φ = 760632.

The previous prime is 769987. The next prime is 769997. The reversal of 769991 is 199967.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 769991 - 2² = 769987 is a prime.

It is a super-2 number, since 2×769991² = 1185772280162, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4556 + ... + 4721.

It is an arithmetic number, because the mean of its divisors is an integer number (194838).

2⁷⁶⁹⁹⁹¹ is an apocalyptic number.

769991 is a deficient number, since it is larger than the sum of its proper divisors (9361).

769991 is an equidigital number, since it uses as much as digits as its factorization.

769991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360.

The product of its digits is 30618, while the sum is 41.

The square root of 769991 is about 877.4913104983. The cubic root of 769991 is about 91.6562074384.

The spelling of 769991 in words is "seven hundred sixty-nine thousand, nine hundred ninety-one".