1223815812 has 24 divisors (see below), whose sum is σ = 2881771200. Its totient is φ = 404195616.

The previous prime is 1223815807. The next prime is 1223815823. The reversal of 1223815812 is 2185183221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466512 + ... + 469127.

It is an arithmetic number, because the mean of its divisors is an integer number (120073800).

Almost surely, 2^1223815812 is an apocalyptic number.

1223815812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1223815812 is an abundant number, since it is smaller than the sum of its proper divisors (1657955388).

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

1223815812 is a wasteful number, since it uses less digits than its factorization.

1223815812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935755 (or 935753 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 1223815812 is about 34983.0789382524. The cubic root of 1223815812 is about 1069.6425894526.

The spelling of 1223815812 in words is "one billion, two hundred twenty-three million, eight hundred fifteen thousand, eight hundred twelve".