691380 has 72 divisors (see below), whose sum is σ = 2201472. Its totient is φ = 175296.

The previous prime is 691363. The next prime is 691381. The reversal of 691380 is 83196.

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 691380.

It is not an unprimeable number, because it can be changed into a prime (691381) by changing a digit.

691380 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4057 + ... + 4223.

It is an arithmetic number, because the mean of its divisors is an integer number (30576).

2⁶⁹¹³⁸⁰ is an apocalyptic number.

691380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100736).

691380 is an abundant number, since it is smaller than the sum of its proper divisors (1510092).

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

691380 is a wasteful number, since it uses less digits than its factorization.

691380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 691380 is about 831.4926337617. The cubic root of 691380 is about 88.4244303668.

The spelling of 691380 in words is "six hundred ninety-one thousand, three hundred eighty".