2656406 has 4 divisors (see below), whose sum is σ = 3984612. Its totient is φ = 1328202.

The previous prime is 2656399. The next prime is 2656417. The reversal of 2656406 is 6046562.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664100 + ... + 664103.

It is an arithmetic number, because the mean of its divisors is an integer number (996153).

2^2656406 is an apocalyptic number.

2656406 is a deficient number, since it is larger than the sum of its proper divisors (1328206).

2656406 is a wasteful number, since it uses less digits than its factorization.

2656406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328205.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2656406 is about 1629.8484592133. The cubic root of 2656406 is about 138.4941675397.

The spelling of 2656406 in words is "two million, six hundred fifty-six thousand, four hundred six".