864619 has 4 divisors (see below), whose sum is σ = 988144. Its totient is φ = 741096.

The previous prime is 864613. The next prime is 864623. The reversal of 864619 is 916468.

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 864619 - 2⁵ = 864587 is a prime.

It is a super-2 number, since 2×864619² = 1495132030322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61752 + ... + 61765.

It is an arithmetic number, because the mean of its divisors is an integer number (247036).

2⁸⁶⁴⁶¹⁹ is an apocalyptic number.

864619 is a deficient number, since it is larger than the sum of its proper divisors (123525).

864619 is a wasteful number, since it uses less digits than its factorization.

864619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123524.

The product of its digits is 10368, while the sum is 34.

The square root of 864619 is about 929.8489124584. The cubic root of 864619 is about 95.2668030877.

The spelling of 864619 in words is "eight hundred sixty-four thousand, six hundred nineteen".