1211315440 has 20 divisors (see below), whose sum is σ = 2816308584. Its totient is φ = 484526144.

The previous prime is 1211315437. The next prime is 1211315449. The reversal of 1211315440 is 445131121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211315449) by changing a digit.

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, 7570642 + ... + 7570801.

Almost surely, 2^1211315440 is an apocalyptic number.

1211315440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211315440 is an abundant number, since it is smaller than the sum of its proper divisors (1604993144).

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

1211315440 is a wasteful number, since it uses less digits than its factorization.

1211315440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15141456 (or 15141450 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1211315440 is about 34803.9572462673. The cubic root of 1211315440 is about 1065.9882500315.

Adding to 1211315440 its reverse (445131121), we get a palindrome (1656446561).

The spelling of 1211315440 in words is "one billion, two hundred eleven million, three hundred fifteen thousand, four hundred forty".