2639945 has 16 divisors (see below), whose sum is σ = 3950208. Its totient is φ = 1645440.

The previous prime is 2639941. The next prime is 2639953. The reversal of 2639945 is 5499362.

It is not a de Polignac number, because 2639945 - 2² = 2639941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2639899 and 2639908.

It is not an unprimeable number, because it can be changed into a prime (2639941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3044 + ... + 3813.

It is an arithmetic number, because the mean of its divisors is an integer number (246888).

2^2639945 is an apocalyptic number.

It is an amenable number.

2639945 is a deficient number, since it is larger than the sum of its proper divisors (1310263).

2639945 is a wasteful number, since it uses less digits than its factorization.

2639945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6880.

The product of its digits is 58320, while the sum is 38.

The square root of 2639945 is about 1624.7907557590. The cubic root of 2639945 is about 138.2075048126.

The spelling of 2639945 in words is "two million, six hundred thirty-nine thousand, nine hundred forty-five".