1242191140 has 12 divisors (see below), whose sum is σ = 2608601436. Its totient is φ = 496876448.

The previous prime is 1242191113. The next prime is 1242191143. The reversal of 1242191140 is 411912421.

It can be written as a sum of positive squares in 2 ways, for example, as 873320704 + 368870436 = 29552^2 + 19206^2 .

It is not an unprimeable number, because it can be changed into a prime (1242191143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31054759 + ... + 31054798.

It is an arithmetic number, because the mean of its divisors is an integer number (217383453).

Almost surely, 2^1242191140 is an apocalyptic number.

1242191140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242191140 is an abundant number, since it is smaller than the sum of its proper divisors (1366410296).

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

1242191140 is a wasteful number, since it uses less digits than its factorization.

1242191140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62109566 (or 62109564 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1242191140 is about 35244.7320886399. The cubic root of 1242191140 is about 1074.9695004868.

The spelling of 1242191140 in words is "one billion, two hundred forty-two million, one hundred ninety-one thousand, one hundred forty".