2257639 has 2 divisors, whose sum is σ = 2257640. Its totient is φ = 2257638.

The previous prime is 2257609. The next prime is 2257643. The reversal of 2257639 is 9367522.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2257639 - 2⁷ = 2257511 is a prime.

2257639 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2257609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128819 + 1128820.

It is an arithmetic number, because the mean of its divisors is an integer number (1128820).

2^2257639 is an apocalyptic number.

2257639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2257639 is an equidigital number, since it uses as much as digits as its factorization.

2257639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 2257639 is about 1502.5441757233. The cubic root of 2257639 is about 131.1851973372.

The spelling of 2257639 in words is "two million, two hundred fifty-seven thousand, six hundred thirty-nine".