1212440140 has 12 divisors (see below), whose sum is σ = 2546124336. Its totient is φ = 484976048.

The previous prime is 1212440123. The next prime is 1212440143. The reversal of 1212440140 is 410442121.

It is a super-2 number, since 2×1212440140² = 2940022186166439200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212440143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30310984 + ... + 30311023.

It is an arithmetic number, because the mean of its divisors is an integer number (212177028).

Almost surely, 2^1212440140 is an apocalyptic number.

1212440140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212440140 is an abundant number, since it is smaller than the sum of its proper divisors (1333684196).

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

1212440140 is a wasteful number, since it uses less digits than its factorization.

1212440140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60622016 (or 60622014 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1212440140 is about 34820.1111428439. Note that the first 4 decimals coincide. The cubic root of 1212440140 is about 1066.3180694641.

Adding to 1212440140 its reverse (410442121), we get a palindrome (1622882261).

The spelling of 1212440140 in words is "one billion, two hundred twelve million, four hundred forty thousand, one hundred forty".