2651806 has 4 divisors (see below), whose sum is σ = 3977712. Its totient is φ = 1325902.

The previous prime is 2651791. The next prime is 2651807. The reversal of 2651806 is 6081562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6081562 = 2 ⋅3040781.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662950 + ... + 662953.

It is an arithmetic number, because the mean of its divisors is an integer number (994428).

2^2651806 is an apocalyptic number.

2651806 is a deficient number, since it is larger than the sum of its proper divisors (1325906).

2651806 is a wasteful number, since it uses less digits than its factorization.

2651806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325905.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2651806 is about 1628.4366736229. The cubic root of 2651806 is about 138.4141796090.

The spelling of 2651806 in words is "two million, six hundred fifty-one thousand, eight hundred six".