812469785 has 4 divisors (see below), whose sum is σ = 974963748. Its totient is φ = 649975824.

The previous prime is 812469781. The next prime is 812469799. The reversal of 812469785 is 587964218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587964218 = 2 ⋅293982109.

It can be written as a sum of positive squares in 2 ways, for example, as 382280704 + 430189081 = 19552^2 + 20741^2 .

It is a cyclic number.

It is not a de Polignac number, because 812469785 - 2² = 812469781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812469781) 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, 81246974 + ... + 81246983.

It is an arithmetic number, because the mean of its divisors is an integer number (243740937).

Almost surely, 2^812469785 is an apocalyptic number.

It is an amenable number.

812469785 is a deficient number, since it is larger than the sum of its proper divisors (162493963).

812469785 is a wasteful number, since it uses less digits than its factorization.

812469785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162493962.

The product of its digits is 967680, while the sum is 50.

The square root of 812469785 is about 28503.8556163899. The cubic root of 812469785 is about 933.1162221046.

The spelling of 812469785 in words is "eight hundred twelve million, four hundred sixty-nine thousand, seven hundred eighty-five".