3121240140 has 72 divisors (see below), whose sum is σ = 9687966288. Its totient is φ = 812972160.

The previous prime is 3121240127. The next prime is 3121240141. The reversal of 3121240140 is 410421213.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (3121240141) 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 23 ways as a sum of consecutive naturals, for example, 193891 + ... + 209370.

Almost surely, 2^3121240140 is an apocalyptic number.

3121240140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3121240140 is an abundant number, since it is smaller than the sum of its proper divisors (6566726148).

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

3121240140 is a wasteful number, since it uses less digits than its factorization.

3121240140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403319 (or 403314 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 3121240140 is about 55868.0601059317. The cubic root of 3121240140 is about 1461.4222926049.

Adding to 3121240140 its reverse (410421213), we get a palindrome (3531661353).

The spelling of 3121240140 in words is "three billion, one hundred twenty-one million, two hundred forty thousand, one hundred forty".