691982 has 8 divisors (see below), whose sum is σ = 1071552. Its totient is φ = 334800.

The previous prime is 691979. The next prime is 691991. The reversal of 691982 is 289196.

691982 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691982.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5519 + ... + 5642.

It is an arithmetic number, because the mean of its divisors is an integer number (133944).

2⁶⁹¹⁹⁸² is an apocalyptic number.

691982 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

691982 is a deficient number, since it is larger than the sum of its proper divisors (379570).

691982 is a wasteful number, since it uses less digits than its factorization.

691982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11194.

The product of its digits is 7776, while the sum is 35.

The square root of 691982 is about 831.8545545947. The cubic root of 691982 is about 88.4500872968.

The spelling of 691982 in words is "six hundred ninety-one thousand, nine hundred eighty-two".