1121405 has 16 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 828672.

The previous prime is 1121389. The next prime is 1121423. The reversal of 1121405 is 5041211.

It is a cyclic number.

It is not a de Polignac number, because 1121405 - 2⁴ = 1121389 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121405.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6632 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1121405 is an apocalyptic number.

It is an amenable number.

1121405 is a deficient number, since it is larger than the sum of its proper divisors (330115).

1121405 is a wasteful number, since it uses less digits than its factorization.

1121405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1121405 is about 1058.9641164837. The cubic root of 1121405 is about 103.8932892139.

Adding to 1121405 its reverse (5041211), we get a palindrome (6162616).

The spelling of 1121405 in words is "one million, one hundred twenty-one thousand, four hundred five".