431780399 has 16 divisors (see below), whose sum is σ = 469670400. Its totient is φ = 395382144.

The previous prime is 431780383. The next prime is 431780413. The reversal of 431780399 is 993087134.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 431780399 - 2⁴ = 431780383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431780309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141512 + ... + 144530.

It is an arithmetic number, because the mean of its divisors is an integer number (29354400).

Almost surely, 2^431780399 is an apocalyptic number.

431780399 is a deficient number, since it is larger than the sum of its proper divisors (37890001).

431780399 is a wasteful number, since it uses less digits than its factorization.

431780399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 431780399 is about 20779.3262402803. The cubic root of 431780399 is about 755.8245156694.

The spelling of 431780399 in words is "four hundred thirty-one million, seven hundred eighty thousand, three hundred ninety-nine".