864634 has 4 divisors (see below), whose sum is σ = 1296954. Its totient is φ = 432316.

The previous prime is 864631. The next prime is 864641. The reversal of 864634 is 436468.

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

It can be written as a sum of positive squares in only one way, i.e., 804609 + 60025 = 897^2 + 245^2 .

It is a junction number, because it is equal to n+sod(n) for n = 864596 and 864605.

It is not an unprimeable number, because it can be changed into a prime (864631) 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 as a sum of consecutive naturals, namely, 216157 + ... + 216160.

2⁸⁶⁴⁶³⁴ is an apocalyptic number.

864634 is a deficient number, since it is larger than the sum of its proper divisors (432320).

864634 is a wasteful number, since it uses less digits than its factorization.

864634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432319.

The product of its digits is 13824, while the sum is 31.

The square root of 864634 is about 929.8569782499. The cubic root of 864634 is about 95.2673540024.

The spelling of 864634 in words is "eight hundred sixty-four thousand, six hundred thirty-four".