691974 has 24 divisors (see below), whose sum is σ = 1541280. Its totient is φ = 224208.

The previous prime is 691973. The next prime is 691979. The reversal of 691974 is 479196.

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 691974.

It is not an unprimeable number, because it can be changed into a prime (691973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147 + ... + 1185.

It is an arithmetic number, because the mean of its divisors is an integer number (64220).

2⁶⁹¹⁹⁷⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770640).

691974 is an abundant number, since it is smaller than the sum of its proper divisors (849306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691974 is a wasteful number, since it uses less digits than its factorization.

691974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084 (or 1081 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 691974 is about 831.8497460479. The cubic root of 691974 is about 88.4497464385.

The spelling of 691974 in words is "six hundred ninety-one thousand, nine hundred seventy-four".