1213011440 has 20 divisors (see below), whose sum is σ = 2820251784. Its totient is φ = 485204544.

The previous prime is 1213011427. The next prime is 1213011451. The reversal of 1213011440 is 441103121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7581242 + ... + 7581401.

Almost surely, 2^1213011440 is an apocalyptic number.

1213011440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213011440 is an abundant number, since it is smaller than the sum of its proper divisors (1607240344).

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

1213011440 is a wasteful number, since it uses less digits than its factorization.

1213011440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15162656 (or 15162650 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1213011440 is about 34828.3137691161. The cubic root of 1213011440 is about 1066.4855256640.

Adding to 1213011440 its reverse (441103121), we get a palindrome (1654114561).

The spelling of 1213011440 in words is "one billion, two hundred thirteen million, eleven thousand, four hundred forty".