2666405 has 32 divisors (see below), whose sum is σ = 3939840. Its totient is φ = 1693440.

The previous prime is 2666393. The next prime is 2666423. The reversal of 2666405 is 5046662.

It is a de Polignac number, because none of the positive numbers 2^k-2666405 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37520 + ... + 37590.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

2^2666405 is an apocalyptic number.

It is an amenable number.

2666405 is a deficient number, since it is larger than the sum of its proper divisors (1273435).

2666405 is a wasteful number, since it uses less digits than its factorization.

2666405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2666405 is about 1632.9130411629. The cubic root of 2666405 is about 138.6677189834.

The spelling of 2666405 in words is "two million, six hundred sixty-six thousand, four hundred five".