864787 has 12 divisors (see below), whose sum is σ = 1087408. Its totient is φ = 673200.

The previous prime is 864781. The next prime is 864793. The reversal of 864787 is 787468.

It is an interprime number because it is at equal distance from previous prime (864781) and next prime (864793).

It is not a de Polignac number, because 864787 - 2¹¹ = 862739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337 + ... + 1357.

2⁸⁶⁴⁷⁸⁷ is an apocalyptic number.

864787 is a deficient number, since it is larger than the sum of its proper divisors (222621).

864787 is a wasteful number, since it uses less digits than its factorization.

864787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 1039 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 864787 is about 929.9392453273. The cubic root of 864787 is about 95.2729729677.

The spelling of 864787 in words is "eight hundred sixty-four thousand, seven hundred eighty-seven".