2026639 has 2 divisors, whose sum is σ = 2026640. Its totient is φ = 2026638.

The previous prime is 2026631. The next prime is 2026663. The reversal of 2026639 is 9366202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2026639 - 2³ = 2026631 is a prime.

It is an Ulam number.

2026639 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2026631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1013319 + 1013320.

It is an arithmetic number, because the mean of its divisors is an integer number (1013320).

2^2026639 is an apocalyptic number.

2026639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2026639 is an equidigital number, since it uses as much as digits as its factorization.

2026639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 2026639 is about 1423.6007164932. The cubic root of 2026639 is about 126.5490235816.

The spelling of 2026639 in words is "two million, twenty-six thousand, six hundred thirty-nine".