1266405 has 24 divisors (see below), whose sum is σ = 2358432. Its totient is φ = 578592.

The previous prime is 1266389. The next prime is 1266409. The reversal of 1266405 is 5046621.

It is not a de Polignac number, because 1266405 - 2⁴ = 1266389 is a prime.

1266405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127 + ... + 1596.

It is an arithmetic number, because the mean of its divisors is an integer number (98268).

2^1266405 is an apocalyptic number.

1266405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266405 is a deficient number, since it is larger than the sum of its proper divisors (1092027).

1266405 is a wasteful number, since it uses less digits than its factorization.

1266405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1266405 is about 1125.3466132708. The cubic root of 1266405 is about 108.1909345364.

The spelling of 1266405 in words is "one million, two hundred sixty-six thousand, four hundred five".