431721385 has 8 divisors (see below), whose sum is σ = 540590400. Its totient is φ = 330360624.

The previous prime is 431721383. The next prime is 431721427. The reversal of 431721385 is 583127134.

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

It is a cyclic number.

It is not a de Polignac number, because 431721385 - 2¹ = 431721383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431721385.

It is not an unprimeable number, because it can be changed into a prime (431721383) 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 7 ways as a sum of consecutive naturals, for example, 1876935 + ... + 1877164.

It is an arithmetic number, because the mean of its divisors is an integer number (67573800).

Almost surely, 2^431721385 is an apocalyptic number.

It is an amenable number.

431721385 is a deficient number, since it is larger than the sum of its proper divisors (108869015).

431721385 is a wasteful number, since it uses less digits than its factorization.

431721385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3754127.

The product of its digits is 20160, while the sum is 34.

The square root of 431721385 is about 20777.9061745884. The cubic root of 431721385 is about 755.7900797537.

The spelling of 431721385 in words is "four hundred thirty-one million, seven hundred twenty-one thousand, three hundred eighty-five".