1228821836 has 24 divisors (see below), whose sum is σ = 2400492864. Its totient is φ = 545564880.

The previous prime is 1228821823. The next prime is 1228821857. The reversal of 1228821836 is 6381288221.

It is a junction number, because it is equal to n+sod(n) for n = 1228821793 and 1228821802.

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, 322850 + ... + 326633.

It is an arithmetic number, because the mean of its divisors is an integer number (100020536).

Almost surely, 2^1228821836 is an apocalyptic number.

It is an amenable number.

1228821836 is a deficient number, since it is larger than the sum of its proper divisors (1171671028).

1228821836 is a wasteful number, since it uses less digits than its factorization.

1228821836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649541 (or 649539 counting only the distinct ones).

The product of its digits is 73728, while the sum is 41.

The square root of 1228821836 is about 35054.5551390971. Note that the first 3 decimals coincide. The cubic root of 1228821836 is about 1071.0990645982.

The spelling of 1228821836 in words is "one billion, two hundred twenty-eight million, eight hundred twenty-one thousand, eight hundred thirty-six".