431387 has 4 divisors (see below), whose sum is σ = 470616. Its totient is φ = 392160.

The previous prime is 431381. The next prime is 431399. The reversal of 431387 is 783134.

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 431387 - 2¹⁶ = 365851 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (431381) 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, 19598 + ... + 19619.

It is an arithmetic number, because the mean of its divisors is an integer number (117654).

2⁴³¹³⁸⁷ is an apocalyptic number.

431387 is a deficient number, since it is larger than the sum of its proper divisors (39229).

431387 is a wasteful number, since it uses less digits than its factorization.

431387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39228.

The product of its digits is 2016, while the sum is 26.

The square root of 431387 is about 656.8005785625. The cubic root of 431387 is about 75.5594899752.

It can be divided in two parts, 431 and 387, that added together give a palindrome (818).

The spelling of 431387 in words is "four hundred thirty-one thousand, three hundred eighty-seven".