2645906 has 4 divisors (see below), whose sum is σ = 3968862. Its totient is φ = 1322952.

The previous prime is 2645899. The next prime is 2645911. The reversal of 2645906 is 6095462.

2645906 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 an emirpimes, since its reverse is a distinct semiprime: 6095462 = 2 ⋅3047731.

It can be written as a sum of positive squares in only one way, i.e., 2235025 + 410881 = 1495^2 + 641^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 661475 + ... + 661478.

2^2645906 is an apocalyptic number.

2645906 is a deficient number, since it is larger than the sum of its proper divisors (1322956).

2645906 is a wasteful number, since it uses less digits than its factorization.

2645906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322955.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2645906 is about 1626.6241114652. The cubic root of 2645906 is about 138.3114508701.

The spelling of 2645906 in words is "two million, six hundred forty-five thousand, nine hundred six".