4028431 has 4 divisors (see below), whose sum is σ = 4394664. Its totient is φ = 3662200.

The previous prime is 4028429. The next prime is 4028441. The reversal of 4028431 is 1348204.

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 4028431 - 2¹ = 4028429 is a prime.

It is a super-2 number, since 2×4028431² = 32456512643522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) 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 (4028441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183100 + ... + 183121.

It is an arithmetic number, because the mean of its divisors is an integer number (1098666).

Almost surely, 2^4028431 is an apocalyptic number.

4028431 is a deficient number, since it is larger than the sum of its proper divisors (366233).

4028431 is a wasteful number, since it uses less digits than its factorization.

4028431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366232.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 4028431 is about 2007.0951646596. The cubic root of 4028431 is about 159.1153126300.

The spelling of 4028431 in words is "four million, twenty-eight thousand, four hundred thirty-one".