1026643 has 4 divisors (see below), whose sum is σ = 1029448. Its totient is φ = 1023840.

The previous prime is 1026593. The next prime is 1026661. The reversal of 1026643 is 3466201.

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 1026643 - 2¹⁷ = 895571 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1026673) 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, 753 + ... + 1618.

It is an arithmetic number, because the mean of its divisors is an integer number (257362).

2^1026643 is an apocalyptic number.

1026643 is a deficient number, since it is larger than the sum of its proper divisors (2805).

1026643 is an equidigital number, since it uses as much as digits as its factorization.

1026643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1026643 is about 1013.2339315282. The cubic root of 1026643 is about 100.8803274939.

The spelling of 1026643 in words is "one million, twenty-six thousand, six hundred forty-three".