2640001 has 16 divisors (see below), whose sum is σ = 3305344. Its totient is φ = 2052864.

The previous prime is 2639999. The next prime is 2640013. The reversal of 2640001 is 1000462.

It is a 6-Lehmer number, since φ(2640001) divides (2640001-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 2640001 - 2¹ = 2639999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5881 + ... + 6313.

It is an arithmetic number, because the mean of its divisors is an integer number (206584).

2^2640001 is an apocalyptic number.

It is an amenable number.

2640001 is a deficient number, since it is larger than the sum of its proper divisors (665343).

2640001 is a wasteful number, since it uses less digits than its factorization.

2640001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2640001 is about 1624.8079886559. The cubic root of 2640001 is about 138.2084820508.

Adding to 2640001 its reverse (1000462), we get a palindrome (3640463).

The spelling of 2640001 in words is "two million, six hundred forty thousand, one".