691894 has 16 divisors (see below), whose sum is σ = 1204128. Its totient is φ = 292032.

The previous prime is 691891. The next prime is 691897. The reversal of 691894 is 498196.

It is an interprime number because it is at equal distance from previous prime (691891) and next prime (691897).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691891) 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 in 7 ways as a sum of consecutive naturals, for example, 684 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (75258).

2⁶⁹¹⁸⁹⁴ is an apocalyptic number.

691894 is a deficient number, since it is larger than the sum of its proper divisors (512234).

691894 is a wasteful number, since it uses less digits than its factorization.

691894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its digits is 15552, while the sum is 37.

The square root of 691894 is about 831.8016590510. The cubic root of 691894 is about 88.4463377110.

The spelling of 691894 in words is "six hundred ninety-one thousand, eight hundred ninety-four".