861780933 has 12 divisors (see below), whose sum is σ = 1340548300. Its totient is φ = 530326656.

The previous prime is 861780911. The next prime is 861780943. The reversal of 861780933 is 339087168.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 257506209 + 604274724 = 16047^2 + 24582^2 .

It is not a de Polignac number, because 861780933 - 2¹⁰ = 861779909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861780943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3682708 + ... + 3682941.

Almost surely, 2^861780933 is an apocalyptic number.

It is an amenable number.

861780933 is a deficient number, since it is larger than the sum of its proper divisors (478767367).

861780933 is a wasteful number, since it uses less digits than its factorization.

861780933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7365668 (or 7365665 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 861780933 is about 29356.1055489314. The cubic root of 861780933 is about 951.6245271691.

The spelling of 861780933 in words is "eight hundred sixty-one million, seven hundred eighty thousand, nine hundred thirty-three".