2563406 has 4 divisors (see below), whose sum is σ = 3845112. Its totient is φ = 1281702.

The previous prime is 2563387. The next prime is 2563409. The reversal of 2563406 is 6043652.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640850 + ... + 640853.

It is an arithmetic number, because the mean of its divisors is an integer number (961278).

2^2563406 is an apocalyptic number.

2563406 is a deficient number, since it is larger than the sum of its proper divisors (1281706).

2563406 is a wasteful number, since it uses less digits than its factorization.

2563406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281705.

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

The square root of 2563406 is about 1601.0640212059. The cubic root of 2563406 is about 136.8587173698.

The spelling of 2563406 in words is "two million, five hundred sixty-three thousand, four hundred six".