2257665 has 16 divisors (see below), whose sum is σ = 3701376. Its totient is φ = 1174400.

The previous prime is 2257649. The next prime is 2257667. The reversal of 2257665 is 5667522.

2257665 = T₂₉₄ + T₂₉₅ + ... + T₃₃₈.

It is not a de Polignac number, because 2257665 - 2⁴ = 2257649 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 2¹⁹ + 5⁵ + 7³ + 6⁶ + 6⁸ + 5⁵ .

It is not an unprimeable number, because it can be changed into a prime (2257667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1221 + ... + 2450.

It is an arithmetic number, because the mean of its divisors is an integer number (231336).

2^2257665 is an apocalyptic number.

It is an amenable number.

2257665 is a deficient number, since it is larger than the sum of its proper divisors (1443711).

2257665 is a wasteful number, since it uses less digits than its factorization.

2257665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720.

The product of its digits is 25200, while the sum is 33.

The square root of 2257665 is about 1502.5528276903. The cubic root of 2257665 is about 131.1857009315.

The spelling of 2257665 in words is "two million, two hundred fifty-seven thousand, six hundred sixty-five".