1242253140 has 24 divisors (see below), whose sum is σ = 3478308960. Its totient is φ = 331267488.

The previous prime is 1242253139. The next prime is 1242253141. The reversal of 1242253140 is 413522421.

It is an interprime number because it is at equal distance from previous prime (1242253139) and next prime (1242253141).

It is a self number, because there is not a number n which added to its sum of digits gives 1242253140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242253141) 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 7 ways as a sum of consecutive naturals, for example, 10352050 + ... + 10352169.

It is an arithmetic number, because the mean of its divisors is an integer number (144929540).

Almost surely, 2^1242253140 is an apocalyptic number.

1242253140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242253140 is an abundant number, since it is smaller than the sum of its proper divisors (2236055820).

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

1242253140 is a wasteful number, since it uses less digits than its factorization.

1242253140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20704231 (or 20704229 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1242253140 is about 35245.6116417349. The cubic root of 1242253140 is about 1074.9873847447.

Adding to 1242253140 its reverse (413522421), we get a palindrome (1655775561).

The spelling of 1242253140 in words is "one billion, two hundred forty-two million, two hundred fifty-three thousand, one hundred forty".