1225233918 has 32 divisors (see below), whose sum is σ = 2726515200. Its totient is φ = 407845368.

The previous prime is 1225233907. The next prime is 1225233953. The reversal of 1225233918 is 8193325221.

1225233918 is a `hidden beast` number, since 12 + 252 + 3 + 391 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24555 + ... + 55257.

It is an arithmetic number, because the mean of its divisors is an integer number (85203600).

Almost surely, 2^1225233918 is an apocalyptic number.

1225233918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1225233918 is an abundant number, since it is smaller than the sum of its proper divisors (1501281282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225233918 is a wasteful number, since it uses less digits than its factorization.

1225233918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31453 (or 31447 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1225233918 is about 35003.3415262029. The cubic root of 1225233918 is about 1070.0555821711.

The spelling of 1225233918 in words is "one billion, two hundred twenty-five million, two hundred thirty-three thousand, nine hundred eighteen".