855398615 has 4 divisors (see below), whose sum is σ = 1026478344. Its totient is φ = 684318888.

The previous prime is 855398611. The next prime is 855398617. The reversal of 855398615 is 516893558.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 855398615 - 2² = 855398611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855398611) 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, 85539857 + ... + 85539866.

It is an arithmetic number, because the mean of its divisors is an integer number (256619586).

Almost surely, 2^855398615 is an apocalyptic number.

855398615 is a deficient number, since it is larger than the sum of its proper divisors (171079729).

855398615 is a wasteful number, since it uses less digits than its factorization.

855398615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171079728.

The product of its digits is 1296000, while the sum is 50.

The square root of 855398615 is about 29247.1984128395. The cubic root of 855398615 is about 949.2694716253.

The spelling of 855398615 in words is "eight hundred fifty-five million, three hundred ninety-eight thousand, six hundred fifteen".