691386 has 16 divisors (see below), whose sum is σ = 1394400. Its totient is φ = 228528.

The previous prime is 691381. The next prime is 691399. The reversal of 691386 is 683196.

691386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691386.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420 + ... + 1248.

It is an arithmetic number, because the mean of its divisors is an integer number (87150).

2⁶⁹¹³⁸⁶ is an apocalyptic number.

691386 is an abundant number, since it is smaller than the sum of its proper divisors (703014).

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

691386 is a wasteful number, since it uses less digits than its factorization.

691386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973.

The product of its digits is 7776, while the sum is 33.

The square root of 691386 is about 831.4962417233. The cubic root of 691386 is about 88.4246861572.

The spelling of 691386 in words is "six hundred ninety-one thousand, three hundred eighty-six".