1227771738 has 36 divisors (see below), whose sum is σ = 2681917290. Its totient is φ = 405938736.

The previous prime is 1227771737. The next prime is 1227771751. The reversal of 1227771738 is 8371777221.

It can be written as a sum of positive squares in only one way, i.e., 651627729 + 576144009 = 25527^2 + 24003^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1227771693 and 1227771702.

It is not an unprimeable number, because it can be changed into a prime (1227771731) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 288208 + ... + 292436.

Almost surely, 2^1227771738 is an apocalyptic number.

1227771738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1227771738 is an abundant number, since it is smaller than the sum of its proper divisors (1454145552).

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

1227771738 is a wasteful number, since it uses less digits than its factorization.

1227771738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4491 (or 4361 counting only the distinct ones).

The product of its digits is 230496, while the sum is 45.

The square root of 1227771738 is about 35039.5738843953. The cubic root of 1227771738 is about 1070.7938726669.

The spelling of 1227771738 in words is "one billion, two hundred twenty-seven million, seven hundred seventy-one thousand, seven hundred thirty-eight".