2645857 has 4 divisors (see below), whose sum is σ = 2651440. Its totient is φ = 2640276.

The previous prime is 2645849. The next prime is 2645861. The reversal of 2645857 is 7585462.

It is a happy number.

2645857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7585462 = 2 ⋅3792731.

It is a cyclic number.

It is not a de Polignac number, because 2645857 - 2³ = 2645849 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 6⁵ + 4⁷ + 5³ + 8⁷ + 5³ + 7 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2645827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2007 + ... + 3052.

It is an arithmetic number, because the mean of its divisors is an integer number (662860).

2^2645857 is an apocalyptic number.

It is an amenable number.

2645857 is a deficient number, since it is larger than the sum of its proper divisors (5583).

2645857 is an equidigital number, since it uses as much as digits as its factorization.

2645857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582.

The product of its digits is 67200, while the sum is 37.

The square root of 2645857 is about 1626.6090495260. The cubic root of 2645857 is about 138.3105970601.

The spelling of 2645857 in words is "two million, six hundred forty-five thousand, eight hundred fifty-seven".