430991 has 4 divisors (see below), whose sum is σ = 470184. Its totient is φ = 391800.

The previous prime is 430987. The next prime is 430999. The reversal of 430991 is 199034.

It is a happy number.

430991 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 430991 - 2² = 430987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 430991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (430999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19580 + ... + 19601.

It is an arithmetic number, because the mean of its divisors is an integer number (117546).

2⁴³⁰⁹⁹¹ is an apocalyptic number.

430991 is a deficient number, since it is larger than the sum of its proper divisors (39193).

430991 is a wasteful number, since it uses less digits than its factorization.

430991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39192.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 430991 is about 656.4990479810. The cubic root of 430991 is about 75.5363624676.

The spelling of 430991 in words is "four hundred thirty thousand, nine hundred ninety-one".