2646405 has 16 divisors (see below), whose sum is σ = 4704960. Its totient is φ = 1411344.

The previous prime is 2646361. The next prime is 2646409. The reversal of 2646405 is 5046462.

It is a happy number.

2646405 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 2646405 - 2⁹ = 2645893 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2646409) 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, 9667 + ... + 9936.

It is an arithmetic number, because the mean of its divisors is an integer number (294060).

2^2646405 is an apocalyptic number.

It is an amenable number.

2646405 is a deficient number, since it is larger than the sum of its proper divisors (2058555).

2646405 is a wasteful number, since it uses less digits than its factorization.

2646405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19617 (or 19611 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2646405 is about 1626.7774893943. Note that the first 3 decimals coincide. The cubic root of 2646405 is about 138.3201451920.

The spelling of 2646405 in words is "two million, six hundred forty-six thousand, four hundred five".