1213119540 has 72 divisors (see below), whose sum is σ = 3684576168. Its totient is φ = 323078400.

The previous prime is 1213119493. The next prime is 1213119547. The reversal of 1213119540 is 459113121.

It is a happy number.

1213119540 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 119 + 540 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 25765776 + 1187353764 = 5076^2 + 34458^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213119547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149590 + ... + 157490.

It is an arithmetic number, because the mean of its divisors is an integer number (51174669).

Almost surely, 2^1213119540 is an apocalyptic number.

1213119540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213119540 is an abundant number, since it is smaller than the sum of its proper divisors (2471456628).

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

1213119540 is a wasteful number, since it uses less digits than its factorization.

1213119540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8769 (or 8764 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1213119540 is about 34829.8656328158. The cubic root of 1213119540 is about 1066.5172054040.

The spelling of 1213119540 in words is "one billion, two hundred thirteen million, one hundred nineteen thousand, five hundred forty".