691426 has 8 divisors (see below), whose sum is σ = 1082304. Its totient is φ = 330660.

The previous prime is 691409. The next prime is 691433. The reversal of 691426 is 624196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 691394 and 691403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7470 + ... + 7561.

It is an arithmetic number, because the mean of its divisors is an integer number (135288).

2⁶⁹¹⁴²⁶ is an apocalyptic number.

691426 is a deficient number, since it is larger than the sum of its proper divisors (390878).

691426 is a wasteful number, since it uses less digits than its factorization.

691426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15056.

The product of its digits is 2592, while the sum is 28.

The square root of 691426 is about 831.5202944006. The cubic root of 691426 is about 88.4263913886.

The spelling of 691426 in words is "six hundred ninety-one thousand, four hundred twenty-six".