2599906 has 4 divisors (see below), whose sum is σ = 3899862. Its totient is φ = 1299952.

The previous prime is 2599889. The next prime is 2599907. The reversal of 2599906 is 6099952.

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

It can be written as a sum of positive squares in only one way, i.e., 2588881 + 11025 = 1609^2 + 105^2 .

It is a super-2 number, since 2×2599906² = 13519022417672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2599907) 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 as a sum of consecutive naturals, namely, 649975 + ... + 649978.

2^2599906 is an apocalyptic number.

2599906 is a deficient number, since it is larger than the sum of its proper divisors (1299956).

2599906 is a wasteful number, since it uses less digits than its factorization.

2599906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299955.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 2599906 is about 1612.4224012336. The cubic root of 2599906 is about 137.5052295532.

The spelling of 2599906 in words is "two million, five hundred ninety-nine thousand, nine hundred six".