1242720140 has 12 divisors (see below), whose sum is σ = 2609712336. Its totient is φ = 497088048.

The previous prime is 1242720133. The next prime is 1242720163. The reversal of 1242720140 is 410272421.

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, 31067984 + ... + 31068023.

It is an arithmetic number, because the mean of its divisors is an integer number (217476028).

Almost surely, 2^1242720140 is an apocalyptic number.

1242720140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242720140 is an abundant number, since it is smaller than the sum of its proper divisors (1366992196).

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

1242720140 is a wasteful number, since it uses less digits than its factorization.

1242720140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62136016 (or 62136014 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 1242720140 is about 35252.2359574538. The cubic root of 1242720140 is about 1075.1220744730.

Adding to 1242720140 its reverse (410272421), we get a palindrome (1652992561).

The spelling of 1242720140 in words is "one billion, two hundred forty-two million, seven hundred twenty thousand, one hundred forty".