999999769 has 4 divisors (see below), whose sum is σ = 1000373796. Its totient is φ = 999625744.

The previous prime is 999999761. The next prime is 999999797. The reversal of 999999769 is 967999999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 525326400 + 474673369 = 22920^2 + 21787^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999769 - 2³ = 999999761 is a prime.

It is a super-2 number, since 2×999999769² = 1999999076000106722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999999695 and 999999704.

It is not an unprimeable number, because it can be changed into a prime (999999761) 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, 182974 + ... + 188359.

It is an arithmetic number, because the mean of its divisors is an integer number (250093449).

Almost surely, 2^999999769 is an apocalyptic number.

It is an amenable number.

999999769 is a deficient number, since it is larger than the sum of its proper divisors (374027).

999999769 is a wasteful number, since it uses less digits than its factorization.

999999769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374026.

The product of its digits is 200884698, while the sum is 76.

The square root of 999999769 is about 31622.7729492529. The cubic root of 999999769 is about 999.9999230000. Note that the first 4 decimals are identical.

The spelling of 999999769 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred sixty-nine".