694009 has 4 divisors (see below), whose sum is σ = 712804. Its totient is φ = 675216.

The previous prime is 693989. The next prime is 694019. The reversal of 694009 is 900496.

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

It can be written as a sum of positive squares in 2 ways, for example, as 529984 + 164025 = 728^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 694009 - 2⁷ = 693881 is a prime.

It is a Duffinian number.

694009 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (694019) 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, 9342 + ... + 9415.

It is an arithmetic number, because the mean of its divisors is an integer number (178201).

2⁶⁹⁴⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

694009 is a deficient number, since it is larger than the sum of its proper divisors (18795).

694009 is a wasteful number, since it uses less digits than its factorization.

694009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18794.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 694009 is about 833.0720256977. The cubic root of 694009 is about 88.5363677444.

The spelling of 694009 in words is "six hundred ninety-four thousand, nine".