1216422460 has 24 divisors (see below), whose sum is σ = 2786713776. Its totient is φ = 442335360.

The previous prime is 1216422457. The next prime is 1216422461. The reversal of 1216422460 is 642246121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216422461) 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, 2764377 + ... + 2764816.

It is an arithmetic number, because the mean of its divisors is an integer number (116113074).

Almost surely, 2^1216422460 is an apocalyptic number.

1216422460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216422460 is an abundant number, since it is smaller than the sum of its proper divisors (1570291316).

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

1216422460 is a wasteful number, since it uses less digits than its factorization.

1216422460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529213 (or 5529211 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1216422460 is about 34877.2484579848. The cubic root of 1216422460 is about 1067.4842518614.

Adding to 1216422460 its reverse (642246121), we get a palindrome (1858668581).

The spelling of 1216422460 in words is "one billion, two hundred sixteen million, four hundred twenty-two thousand, four hundred sixty".