1225635 has 16 divisors (see below), whose sum is σ = 1982880. Its totient is φ = 646400.

The previous prime is 1225621. The next prime is 1225643. The reversal of 1225635 is 5365221.

It is not a de Polignac number, because 1225635 - 2⁵ = 1225603 is a prime.

It is an Ulam number.

1225635 is a lucky 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, 1111 + ... + 1919.

It is an arithmetic number, because the mean of its divisors is an integer number (123930).

2^1225635 is an apocalyptic number.

1225635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1225635 is a deficient number, since it is larger than the sum of its proper divisors (757245).

1225635 is a wasteful number, since it uses less digits than its factorization.

1225635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918.

The product of its digits is 1800, while the sum is 24.

The square root of 1225635 is about 1107.0840076525. The cubic root of 1225635 is about 107.0172330819.

The spelling of 1225635 in words is "one million, two hundred twenty-five thousand, six hundred thirty-five".