855945493 has 8 divisors (see below), whose sum is σ = 922711608. Its totient is φ = 789311424.

The previous prime is 855945451. The next prime is 855945523. The reversal of 855945493 is 394549558.

It can be written as a sum of positive squares in 4 ways, for example, as 123810129 + 732135364 = 11127^2 + 27058^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855945493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855945493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855945413) 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, 19330 + ... + 45667.

It is an arithmetic number, because the mean of its divisors is an integer number (115338951).

Almost surely, 2^855945493 is an apocalyptic number.

It is an amenable number.

855945493 is a deficient number, since it is larger than the sum of its proper divisors (66766115).

855945493 is a wasteful number, since it uses less digits than its factorization.

855945493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66023.

The product of its digits is 3888000, while the sum is 52.

The square root of 855945493 is about 29256.5461563733. The cubic root of 855945493 is about 949.4717258681.

The spelling of 855945493 in words is "eight hundred fifty-five million, nine hundred forty-five thousand, four hundred ninety-three".