431987 has 4 divisors (see below), whose sum is σ = 457416. Its totient is φ = 406560.

The previous prime is 431983. The next prime is 431993. The reversal of 431987 is 789134.

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 431987 - 2² = 431983 is a prime.

It is a super-2 number, since 2×431987² = 373225536338, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 431987.

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, 12689 + ... + 12722.

It is an arithmetic number, because the mean of its divisors is an integer number (114354).

2⁴³¹⁹⁸⁷ is an apocalyptic number.

431987 is a deficient number, since it is larger than the sum of its proper divisors (25429).

431987 is a wasteful number, since it uses less digits than its factorization.

431987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25428.

The product of its digits is 6048, while the sum is 32.

The square root of 431987 is about 657.2571794967. The cubic root of 431987 is about 75.5945047003.

The spelling of 431987 in words is "four hundred thirty-one thousand, nine hundred eighty-seven".