1242662840 has 32 divisors (see below), whose sum is σ = 2798064000. Its totient is φ = 496696704.

The previous prime is 1242662819. The next prime is 1242662843. The reversal of 1242662840 is 482662421.

It is a self number, because there is not a number n which added to its sum of digits gives 1242662840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242662843) 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, 46766 + ... + 68354.

It is an arithmetic number, because the mean of its divisors is an integer number (87439500).

Almost surely, 2^1242662840 is an apocalyptic number.

1242662840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242662840 is an abundant number, since it is smaller than the sum of its proper divisors (1555401160).

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

1242662840 is a wasteful number, since it uses less digits than its factorization.

1242662840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23039 (or 23035 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 1242662840 is about 35251.4232336795. The cubic root of 1242662840 is about 1075.1055501192.

The spelling of 1242662840 in words is "one billion, two hundred forty-two million, six hundred sixty-two thousand, eight hundred forty".