712857909 has 4 divisors (see below), whose sum is σ = 950477216. Its totient is φ = 475238604.

The previous prime is 712857907. The next prime is 712857917. The reversal of 712857909 is 909758217.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 712857909 - 2¹ = 712857907 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 (712857907) 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, 118809649 + ... + 118809654.

It is an arithmetic number, because the mean of its divisors is an integer number (237619304).

Almost surely, 2^712857909 is an apocalyptic number.

It is an amenable number.

712857909 is a deficient number, since it is larger than the sum of its proper divisors (237619307).

712857909 is a wasteful number, since it uses less digits than its factorization.

712857909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237619306.

The product of its (nonzero) digits is 317520, while the sum is 48.

The square root of 712857909 is about 26699.3990381806. The cubic root of 712857909 is about 893.3075217011.

The spelling of 712857909 in words is "seven hundred twelve million, eight hundred fifty-seven thousand, nine hundred nine".