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769129 = 8772

769129 has 3 divisors (see below), whose sum is σ = 770007. Its totient is φ = 768252.

The previous prime is 769123. The next prime is 769147. The reversal of 769129 is 921967.

The square root of 769129 is 877.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 121104 = 805^2 + 348^2 .

It is not a de Polignac number, because 769129 - 215 = 736361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 769094 and 769103.

It is not an unprimeable number, because it can be changed into a prime (769123) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 439 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (256669).

769129 is a Friedman number, since it can be written as (919-7*6)^2, using all its digits and the basic arithmetic operations.

2769129 is an apocalyptic number.

769129 is the 877-th square number.

769129 is the 439-th centered octagonal number.

It is an amenable number.

769129 is a deficient number, since it is larger than the sum of its proper divisors (878).

769129 is an frugal number, since it uses more digits than its factorization.

769129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 877 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The cubic root of 769129 is about 91.6219918212.

The spelling of 769129 in words is "seven hundred sixty-nine thousand, one hundred twenty-nine".

Divisors: 1 877 769129