1221262460 has 24 divisors (see below), whose sum is σ = 2797801776. Its totient is φ = 444095360.

The previous prime is 1221262459. The next prime is 1221262499. The reversal of 1221262460 is 642621221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2775377 + ... + 2775816.

It is an arithmetic number, because the mean of its divisors is an integer number (116575074).

Almost surely, 2^1221262460 is an apocalyptic number.

1221262460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221262460 is an abundant number, since it is smaller than the sum of its proper divisors (1576539316).

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

1221262460 is a wasteful number, since it uses less digits than its factorization.

1221262460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551213 (or 5551211 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1221262460 is about 34946.5657826345. The cubic root of 1221262460 is about 1068.8981757779.

Adding to 1221262460 its reverse (642621221), we get a palindrome (1863883681).

The spelling of 1221262460 in words is "one billion, two hundred twenty-one million, two hundred sixty-two thousand, four hundred sixty".