2609906 has 16 divisors (see below), whose sum is σ = 4331544. Its totient is φ = 1171584.

The previous prime is 2609903. The next prime is 2609911. The reversal of 2609906 is 6099062.

It can be written as a sum of positive squares in 4 ways, for example, as 2608225 + 1681 = 1615^2 + 41^2 .

It is a super-3 number, since 3×2609906³ = 53332980170955148248, which contains 333 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2609903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 2318.

2^2609906 is an apocalyptic number.

2609906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2609906 is a deficient number, since it is larger than the sum of its proper divisors (1721638).

2609906 is a wasteful number, since it uses less digits than its factorization.

2609906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 2609906 is about 1615.5203496088. The cubic root of 2609906 is about 137.6812991369.

The spelling of 2609906 in words is "two million, six hundred nine thousand, nine hundred six".