1213441440 has 48 divisors (see below), whose sum is σ = 3822342048. Its totient is φ = 323584256.

The previous prime is 1213441433. The next prime is 1213441483. The reversal of 1213441440 is 441443121.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1213441440.

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, 1263522 + ... + 1264481.

It is an arithmetic number, because the mean of its divisors is an integer number (79632126).

Almost surely, 2^1213441440 is an apocalyptic number.

1213441440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213441440 is an abundant number, since it is smaller than the sum of its proper divisors (2608900608).

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

1213441440 is a wasteful number, since it uses less digits than its factorization.

1213441440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528021 (or 2528013 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 1213441440 is about 34834.4863605020. The cubic root of 1213441440 is about 1066.6115301361.

Adding to 1213441440 its reverse (441443121), we get a palindrome (1654884561).

The spelling of 1213441440 in words is "one billion, two hundred thirteen million, four hundred forty-one thousand, four hundred forty".