691396 has 6 divisors (see below), whose sum is σ = 1209950. Its totient is φ = 345696.

The previous prime is 691381. The next prime is 691399. The reversal of 691396 is 693196.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 215296 = 690^2 + 464^2 .

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 as a sum of consecutive naturals, namely, 86421 + ... + 86428.

2⁶⁹¹³⁹⁶ is an apocalyptic number.

It is an amenable number.

691396 is a deficient number, since it is larger than the sum of its proper divisors (518554).

691396 is a wasteful number, since it uses less digits than its factorization.

691396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172853 (or 172851 counting only the distinct ones).

The product of its digits is 8748, while the sum is 34.

The square root of 691396 is about 831.5022549579. The cubic root of 691396 is about 88.4251124712.

The spelling of 691396 in words is "six hundred ninety-one thousand, three hundred ninety-six".