1225918 has 8 divisors (see below), whose sum is σ = 1935720. Its totient is φ = 580680.

The previous prime is 1225909. The next prime is 1225919. The reversal of 1225918 is 8195221.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16093 + ... + 16168.

It is an arithmetic number, because the mean of its divisors is an integer number (241965).

2^1225918 is an apocalyptic number.

1225918 is a deficient number, since it is larger than the sum of its proper divisors (709802).

1225918 is a wasteful number, since it uses less digits than its factorization.

1225918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32282.

The product of its digits is 1440, while the sum is 28.

The square root of 1225918 is about 1107.2118135208. The cubic root of 1225918 is about 107.0254692333.

The spelling of 1225918 in words is "one million, two hundred twenty-five thousand, nine hundred eighteen".