1227808840 has 16 divisors (see below), whose sum is σ = 2762569980. Its totient is φ = 491123520.

The previous prime is 1227808819. The next prime is 1227808859. The reversal of 1227808840 is 488087221.

It can be written as a sum of positive squares in 2 ways, for example, as 1094683396 + 133125444 = 33086^2 + 11538^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 30695221 = 1227808840 / (1 + 2 + 2 + 7 + 8 + 0 + 8 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1227808793 and 1227808802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15347571 + ... + 15347650.

Almost surely, 2^1227808840 is an apocalyptic number.

1227808840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1227808840 is an abundant number, since it is smaller than the sum of its proper divisors (1534761140).

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

1227808840 is a wasteful number, since it uses less digits than its factorization.

1227808840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30695232 (or 30695228 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 1227808840 is about 35040.1033103500. The cubic root of 1227808840 is about 1070.8046586550.

The spelling of 1227808840 in words is "one billion, two hundred twenty-seven million, eight hundred eight thousand, eight hundred forty".