694639 has 4 divisors (see below), whose sum is σ = 757800. Its totient is φ = 631480.

The previous prime is 694633. The next prime is 694649. The reversal of 694639 is 936496.

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 694639 - 2⁷ = 694511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 694598 and 694607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694633) 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, 31564 + ... + 31585.

It is an arithmetic number, because the mean of its divisors is an integer number (189450).

2⁶⁹⁴⁶³⁹ is an apocalyptic number.

694639 is a deficient number, since it is larger than the sum of its proper divisors (63161).

694639 is a wasteful number, since it uses less digits than its factorization.

694639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63160.

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

The square root of 694639 is about 833.4500584918. The cubic root of 694639 is about 88.5631498382.

The spelling of 694639 in words is "six hundred ninety-four thousand, six hundred thirty-nine".