1227161600 has 204 divisors, whose sum is σ = 3510605664. Its totient is φ = 416808960.

The previous prime is 1227161599. The next prime is 1227161623. The reversal of 1227161600 is 61617221.

It is a self number, because there is not a number n which added to its sum of digits gives 1227161600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11468747 + ... + 11468853.

Almost surely, 2^1227161600 is an apocalyptic number.

1227161600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1227161600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1755302832).

1227161600 is an abundant number, since it is smaller than the sum of its proper divisors (2283444064).

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

1227161600 is an frugal number, since it uses more digits than its factorization.

1227161600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1227161600 is about 35030.8663895143. The cubic root of 1227161600 is about 1070.6164671918.

Adding to 1227161600 its reverse (61617221), we get a palindrome (1288778821).

The spelling of 1227161600 in words is "one billion, two hundred twenty-seven million, one hundred sixty-one thousand, six hundred".