964639 has 4 divisors (see below), whose sum is σ = 1038856. Its totient is φ = 890424.

The previous prime is 964637. The next prime is 964661. The reversal of 964639 is 936469.

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 964639 - 2¹ = 964637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 964598 and 964607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (964637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37089 + ... + 37114.

It is an arithmetic number, because the mean of its divisors is an integer number (259714).

2⁹⁶⁴⁶³⁹ is an apocalyptic number.

964639 is a deficient number, since it is larger than the sum of its proper divisors (74217).

964639 is a wasteful number, since it uses less digits than its factorization.

964639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74216.

The product of its digits is 34992, while the sum is 37.

The square root of 964639 is about 982.1603738698. The cubic root of 964639 is about 98.8071271228.

The spelling of 964639 in words is "nine hundred sixty-four thousand, six hundred thirty-nine".