1227252520 has 32 divisors (see below), whose sum is σ = 2973728520. Its totient is φ = 453139200.

The previous prime is 1227252517. The next prime is 1227252529. The reversal of 1227252520 is 252527221.

It can be written as a sum of positive squares in 4 ways, for example, as 778744836 + 448507684 = 27906^2 + 21178^2 .

It is a super-2 number, since 2×1227252520² = 3012297495692700800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1227252529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1179531 + ... + 1180570.

Almost surely, 2^1227252520 is an apocalyptic number.

1227252520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1227252520 is an abundant number, since it is smaller than the sum of its proper divisors (1746476000).

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

1227252520 is a wasteful number, since it uses less digits than its factorization.

1227252520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360125 (or 2360121 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 1227252520 is about 35032.1640781725. The cubic root of 1227252520 is about 1070.6429070797.

Adding to 1227252520 its reverse (252527221), we get a palindrome (1479779741).

The spelling of 1227252520 in words is "one billion, two hundred twenty-seven million, two hundred fifty-two thousand, five hundred twenty".