691430 has 8 divisors (see below), whose sum is σ = 1244592. Its totient is φ = 276568.

The previous prime is 691409. The next prime is 691433. The reversal of 691430 is 34196.

691430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 691396 and 691405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691433) by changing a digit.

691430 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 3 ways as a sum of consecutive naturals, for example, 34562 + ... + 34581.

It is an arithmetic number, because the mean of its divisors is an integer number (155574).

2⁶⁹¹⁴³⁰ is an apocalyptic number.

691430 is a deficient number, since it is larger than the sum of its proper divisors (553162).

691430 is a wasteful number, since it uses less digits than its factorization.

691430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69150.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 691430 is about 831.5226996300. The cubic root of 691430 is about 88.4265619081.

The spelling of 691430 in words is "six hundred ninety-one thousand, four hundred thirty".