1028431 has 4 divisors (see below), whose sum is σ = 1052392. Its totient is φ = 1004472.

The previous prime is 1028411. The next prime is 1028437. The reversal of 1028431 is 1348201.

1028431 = 64² + 65² + ... + 149².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1348201 = 317 ⋅4253.

It is a cyclic number.

It is not a de Polignac number, because 1028431 - 2⁷ = 1028303 is a prime.

It is a super-2 number, since 2×1028431² = 2115340643522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1028399 and 1028408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028437) 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, 11916 + ... + 12001.

It is an arithmetic number, because the mean of its divisors is an integer number (263098).

2^1028431 is an apocalyptic number.

1028431 is the 586-th hex number.

1028431 is a deficient number, since it is larger than the sum of its proper divisors (23961).

1028431 is an equidigital number, since it uses as much as digits as its factorization.

1028431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23960.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1028431 is about 1014.1158710917. The cubic root of 1028431 is about 100.9388578736.

It can be divided in two parts, 10 and 28431, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 1028431 in words is "one million, twenty-eight thousand, four hundred thirty-one".