866862397 has 4 divisors (see below), whose sum is σ = 881555040. Its totient is φ = 852169756.

The previous prime is 866862383. The next prime is 866862421. The reversal of 866862397 is 793268668.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866862397 - 2¹⁵ = 866829629 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 (866842397) 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, 7346233 + ... + 7346350.

It is an arithmetic number, because the mean of its divisors is an integer number (220388760).

Almost surely, 2^866862397 is an apocalyptic number.

It is an amenable number.

866862397 is a deficient number, since it is larger than the sum of its proper divisors (14692643).

866862397 is a wasteful number, since it uses less digits than its factorization.

866862397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14692642.

The product of its digits is 5225472, while the sum is 55.

The square root of 866862397 is about 29442.5270145074. The cubic root of 866862397 is about 953.4912708676.

The spelling of 866862397 in words is "eight hundred sixty-six million, eight hundred sixty-two thousand, three hundred ninety-seven".