1026638 has 4 divisors (see below), whose sum is σ = 1539960. Its totient is φ = 513318.

The previous prime is 1026593. The next prime is 1026661. The reversal of 1026638 is 8366201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8366201 = 149 ⋅56149.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256658 + ... + 256661.

It is an arithmetic number, because the mean of its divisors is an integer number (384990).

2^1026638 is an apocalyptic number.

1026638 is a deficient number, since it is larger than the sum of its proper divisors (513322).

1026638 is an equidigital number, since it uses as much as digits as its factorization.

1026638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513321.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1026638 is about 1013.2314641779. The cubic root of 1026638 is about 100.8801637231.

The spelling of 1026638 in words is "one million, twenty-six thousand, six hundred thirty-eight".