2639806 has 8 divisors (see below), whose sum is σ = 4264344. Its totient is φ = 1218360.

The previous prime is 2639801. The next prime is 2639809. The reversal of 2639806 is 6089362.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639801) 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, 50740 + ... + 50791.

It is an arithmetic number, because the mean of its divisors is an integer number (533043).

2^2639806 is an apocalyptic number.

2639806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2639806 is a deficient number, since it is larger than the sum of its proper divisors (1624538).

2639806 is a wasteful number, since it uses less digits than its factorization.

2639806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101546.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2639806 is about 1624.7479804573. The cubic root of 2639806 is about 138.2050791079.

The spelling of 2639806 in words is "two million, six hundred thirty-nine thousand, eight hundred six".