2656403 has 4 divisors (see below), whose sum is σ = 2812680. Its totient is φ = 2500128.

The previous prime is 2656399. The next prime is 2656417. The reversal of 2656403 is 3046562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3046562 = 2 ⋅1523281.

It is a cyclic number.

It is not a de Polignac number, because 2656403 - 2² = 2656399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78113 + ... + 78146.

It is an arithmetic number, because the mean of its divisors is an integer number (703170).

2^2656403 is an apocalyptic number.

2656403 is a deficient number, since it is larger than the sum of its proper divisors (156277).

2656403 is a wasteful number, since it uses less digits than its factorization.

2656403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156276.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 2656403 is about 1629.8475388821. The cubic root of 2656403 is about 138.4941154038.

The spelling of 2656403 in words is "two million, six hundred fifty-six thousand, four hundred three".