1205553 has 8 divisors (see below), whose sum is σ = 1614816. Its totient is φ = 800000.

The previous prime is 1205549. The next prime is 1205557. The reversal of 1205553 is 3555021.

It is an interprime number because it is at equal distance from previous prime (1205549) and next prime (1205557).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205553 - 2² = 1205549 is a prime.

It is a Curzon number.

1205553 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1205557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (201852).

2^1205553 is an apocalyptic number.

It is an amenable number.

1205553 is a deficient number, since it is larger than the sum of its proper divisors (409263).

1205553 is a wasteful number, since it uses less digits than its factorization.

1205553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 1205553 is about 1097.9767757107. The cubic root of 1205553 is about 106.4295198115.

The spelling of 1205553 in words is "one million, two hundred five thousand, five hundred fifty-three".