1224121440 has 48 divisors (see below), whose sum is σ = 3855984048. Its totient is φ = 326432256.

The previous prime is 1224121427. The next prime is 1224121469. The reversal of 1224121440 is 441214221.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274647 + ... + 1275606.

It is an arithmetic number, because the mean of its divisors is an integer number (80333001).

Almost surely, 2^1224121440 is an apocalyptic number.

1224121440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1224121440 is an abundant number, since it is smaller than the sum of its proper divisors (2631862608).

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

1224121440 is a wasteful number, since it uses less digits than its factorization.

1224121440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550271 (or 2550263 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1224121440 is about 34987.4468917067. The cubic root of 1224121440 is about 1069.7316239604.

Adding to 1224121440 its reverse (441214221), we get a palindrome (1665335661).

The spelling of 1224121440 in words is "one billion, two hundred twenty-four million, one hundred twenty-one thousand, four hundred forty".