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694 = 2347

• 694 can be written using four 4's:

See also 113.
694 has 4 divisors (see below), whose sum is σ = 1044. Its totient is φ = 346.

The previous prime is 691. The next prime is 701. The reversal of 694 is 496.

694 = T20 + T21 + T22.

It is a happy number.

694 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is an alternating number because its digits alternate between even and odd.

694 is strictly pandigital in base 5.

It is a plaindrome in base 8, base 12 and base 14.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172 + ... + 175.

It is an arithmetic number, because the mean of its divisors is an integer number (261).

694 is the 22-nd centered triangular number.

694 is a deficient number, since it is larger than the sum of its proper divisors (350).

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

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

The sum of its prime factors is 349.

The product of its digits is 216, while the sum is 19.

The square root of 694 is about 26.3438797446. The cubic root of 694 is about 8.8535985026.

It can be divided in two parts, 69 and 4, that multiplied together give a triangular number (276 = T23).

The spelling of 694 in words is "six hundred ninety-four", and thus it is an aban number.

Divisors: 1 2 347 694