691394 has 12 divisors (see below), whose sum is σ = 1140342. Its totient is φ = 314160.

The previous prime is 691381. The next prime is 691399. The reversal of 691394 is 493196.

It can be written as a sum of positive squares in only one way, i.e., 543169 + 148225 = 737^2 + 385^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 691394.

It is not an unprimeable number, because it can be changed into a prime (691399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1187 + ... + 1670.

2⁶⁹¹³⁹⁴ is an apocalyptic number.

691394 is a deficient number, since it is larger than the sum of its proper divisors (448948).

691394 is a wasteful number, since it uses less digits than its factorization.

691394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2870 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 691394 is about 831.5010523144. The cubic root of 691394 is about 88.4250272088.

It can be divided in two parts, 6913 and 94, that added together give a palindrome (7007).

The spelling of 691394 in words is "six hundred ninety-one thousand, three hundred ninety-four".