431438647 has 4 divisors (see below), whose sum is σ = 431555040. Its totient is φ = 431322256.

The previous prime is 431438639. The next prime is 431438701. The reversal of 431438647 is 746834134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746834134 = 2 ⋅373417067.

It is a cyclic number.

It is not a de Polignac number, because 431438647 - 2³ = 431438639 is a prime.

It is a super-2 number, since 2×431438647² = 372278612250381218, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431430647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52447 + ... + 60112.

It is an arithmetic number, because the mean of its divisors is an integer number (107888760).

Almost surely, 2^431438647 is an apocalyptic number.

431438647 is a deficient number, since it is larger than the sum of its proper divisors (116393).

431438647 is a wasteful number, since it uses less digits than its factorization.

431438647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116392.

The product of its digits is 193536, while the sum is 40.

The square root of 431438647 is about 20771.1012466841. The cubic root of 431438647 is about 755.6250526095.

The spelling of 431438647 in words is "four hundred thirty-one million, four hundred thirty-eight thousand, six hundred forty-seven".