855397915 has 4 divisors (see below), whose sum is σ = 1026477504. Its totient is φ = 684318328.

The previous prime is 855397913. The next prime is 855397943. The reversal of 855397915 is 519793558.

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 855397915 - 2¹ = 855397913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855397913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85539787 + ... + 85539796.

It is an arithmetic number, because the mean of its divisors is an integer number (256619376).

Almost surely, 2^855397915 is an apocalyptic number.

855397915 is a deficient number, since it is larger than the sum of its proper divisors (171079589).

855397915 is a wasteful number, since it uses less digits than its factorization.

855397915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171079588.

The product of its digits is 1701000, while the sum is 52.

The square root of 855397915 is about 29247.1864458789. The cubic root of 855397915 is about 949.2692126861.

The spelling of 855397915 in words is "eight hundred fifty-five million, three hundred ninety-seven thousand, nine hundred fifteen".