1206405 has 48 divisors (see below), whose sum is σ = 2358720. Its totient is φ = 566784.

The previous prime is 1206391. The next prime is 1206407. The reversal of 1206405 is 5046021.

It is a happy number.

1206405 is a `hidden beast` number, since 1 + 20 + 640 + 5 = 666.

It is not a de Polignac number, because 1206405 - 2⁶ = 1206341 is a prime.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14494 + ... + 14576.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1206405 is an apocalyptic number.

1206405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1206405 is a deficient number, since it is larger than the sum of its proper divisors (1152315).

1206405 is a wasteful number, since it uses less digits than its factorization.

1206405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1206405 is about 1098.3646935331. The cubic root of 1206405 is about 106.4545862051.

The spelling of 1206405 in words is "one million, two hundred six thousand, four hundred five".