1227900816 has 80 divisors (see below), whose sum is σ = 3677800320. Its totient is φ = 391501440.

The previous prime is 1227900811. The next prime is 1227900829. The reversal of 1227900816 is 6180097221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1227900811) by changing a digit.

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, 51855 + ... + 71726.

It is an arithmetic number, because the mean of its divisors is an integer number (45972504).

Almost surely, 2^1227900816 is an apocalyptic number.

1227900816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1227900816 is an abundant number, since it is smaller than the sum of its proper divisors (2449899504).

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

1227900816 is a wasteful number, since it uses less digits than its factorization.

1227900816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123621 (or 123609 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1227900816 is about 35041.4157248248. The cubic root of 1227900816 is about 1070.8313962239.

The spelling of 1227900816 in words is "one billion, two hundred twenty-seven million, nine hundred thousand, eight hundred sixteen".