431989 has 4 divisors (see below), whose sum is σ = 433440. Its totient is φ = 430540.

The previous prime is 431983. The next prime is 431993. The reversal of 431989 is 989134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989134 = 2 ⋅494567.

It is a cyclic number.

It is not a de Polignac number, because 431989 - 2¹⁵ = 399221 is a prime.

It is a super-2 number, since 2×431989² = 373228992242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97 + ... + 934.

It is an arithmetic number, because the mean of its divisors is an integer number (108360).

2⁴³¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

431989 is a deficient number, since it is larger than the sum of its proper divisors (1451).

431989 is a wasteful number, since it uses less digits than its factorization.

431989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450.

The product of its digits is 7776, while the sum is 34.

The square root of 431989 is about 657.2587009694. The cubic root of 431989 is about 75.5946213618.

The spelling of 431989 in words is "four hundred thirty-one thousand, nine hundred eighty-nine".