856440293 has 8 divisors (see below), whose sum is σ = 863835840. Its totient is φ = 849061600.

The previous prime is 856440289. The next prime is 856440313. The reversal of 856440293 is 392044658.

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 856440293 - 2² = 856440289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856440293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856440203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111218 + ... + 118668.

It is an arithmetic number, because the mean of its divisors is an integer number (107979480).

Almost surely, 2^856440293 is an apocalyptic number.

It is an amenable number.

856440293 is a deficient number, since it is larger than the sum of its proper divisors (7395547).

856440293 is a wasteful number, since it uses less digits than its factorization.

856440293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8427.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 856440293 is about 29265.0011617973. The cubic root of 856440293 is about 949.6546456594.

The spelling of 856440293 in words is "eight hundred fifty-six million, four hundred forty thousand, two hundred ninety-three".