1242430140 has 96 divisors (see below), whose sum is σ = 4185054720. Its totient is φ = 269035776.

The previous prime is 1242430129. The next prime is 1242430157. The reversal of 1242430140 is 410342421.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69867 + ... + 85826.

It is an arithmetic number, because the mean of its divisors is an integer number (43594320).

Almost surely, 2^1242430140 is an apocalyptic number.

1242430140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242430140 is an abundant number, since it is smaller than the sum of its proper divisors (2942624580).

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

1242430140 is a wasteful number, since it uses less digits than its factorization.

1242430140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155731 (or 155729 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1242430140 is about 35248.1225031916. The cubic root of 1242430140 is about 1075.0384381424.

Adding to 1242430140 its reverse (410342421), we get a palindrome (1652772561).

The spelling of 1242430140 in words is "one billion, two hundred forty-two million, four hundred thirty thousand, one hundred forty".