1227723220 has 12 divisors (see below), whose sum is σ = 2578218804. Its totient is φ = 491089280.

The previous prime is 1227723169. The next prime is 1227723251. The reversal of 1227723220 is 223277221.

It can be written as a sum of positive squares in 2 ways, for example, as 833938884 + 393784336 = 28878^2 + 19844^2 .

It is a congruent number.

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, 30693061 + ... + 30693100.

It is an arithmetic number, because the mean of its divisors is an integer number (214851567).

Almost surely, 2^1227723220 is an apocalyptic number.

1227723220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1227723220 is an abundant number, since it is smaller than the sum of its proper divisors (1350495584).

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

1227723220 is a wasteful number, since it uses less digits than its factorization.

1227723220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61386170 (or 61386168 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 1227723220 is about 35038.8815460768. The cubic root of 1227723220 is about 1070.7797675854.

The spelling of 1227723220 in words is "one billion, two hundred twenty-seven million, seven hundred twenty-three thousand, two hundred twenty".