1028381 has 4 divisors (see below), whose sum is σ = 1088892. Its totient is φ = 967872.

The previous prime is 1028333. The next prime is 1028389. The reversal of 1028381 is 1838201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1838201 = 83 ⋅22147.

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 156025 = 934^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028381 - 2⁶ = 1028317 is a prime.

It is a super-2 number, since 2×1028381² = 2115134962322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028389) 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, 30230 + ... + 30263.

It is an arithmetic number, because the mean of its divisors is an integer number (272223).

2^1028381 is an apocalyptic number.

It is an amenable number.

1028381 is a deficient number, since it is larger than the sum of its proper divisors (60511).

1028381 is an equidigital number, since it uses as much as digits as its factorization.

1028381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60510.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1028381 is about 1014.0912187767. The cubic root of 1028381 is about 100.9372220404.

The spelling of 1028381 in words is "one million, twenty-eight thousand, three hundred eighty-one".