1242136140 has 96 divisors (see below), whose sum is σ = 3979476480. Its totient is φ = 283585536.

The previous prime is 1242136097. The next prime is 1242136151. The reversal of 1242136140 is 416312421.

It is a self number, because there is not a number n which added to its sum of digits gives 1242136140.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 662244 + ... + 664116.

It is an arithmetic number, because the mean of its divisors is an integer number (41452880).

Almost surely, 2^1242136140 is an apocalyptic number.

1242136140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242136140 is an abundant number, since it is smaller than the sum of its proper divisors (2737340340).

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

1242136140 is a wasteful number, since it uses less digits than its factorization.

1242136140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471 (or 3469 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1242136140 is about 35243.9518215537. The cubic root of 1242136140 is about 1074.9536349211.

Adding to 1242136140 its reverse (416312421), we get a palindrome (1658448561).

The spelling of 1242136140 in words is "one billion, two hundred forty-two million, one hundred thirty-six thousand, one hundred forty".