861943393 has 8 divisors (see below), whose sum is σ = 873648360. Its totient is φ = 850300800.

The previous prime is 861943361. The next prime is 861943427. The reversal of 861943393 is 393349168.

It can be written as a sum of positive squares in 4 ways, for example, as 356907664 + 505035729 = 18892^2 + 22473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861943393 - 2⁵ = 861943361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861943993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12573 + ... + 43381.

It is an arithmetic number, because the mean of its divisors is an integer number (109206045).

Almost surely, 2^861943393 is an apocalyptic number.

It is an amenable number.

861943393 is a deficient number, since it is larger than the sum of its proper divisors (11704967).

861943393 is a wasteful number, since it uses less digits than its factorization.

861943393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31187.

The product of its digits is 419904, while the sum is 46.

The square root of 861943393 is about 29358.8724749436. The cubic root of 861943393 is about 951.6843224144.

The spelling of 861943393 in words is "eight hundred sixty-one million, nine hundred forty-three thousand, three hundred ninety-three".