1242788920 has 32 divisors (see below), whose sum is σ = 2799126720. Its totient is φ = 496608640.

The previous prime is 1242788909. The next prime is 1242788957. The reversal of 1242788920 is 298872421.

It is a congruent number.

It is an unprimeable number.

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, 25185 + ... + 55855.

It is an arithmetic number, because the mean of its divisors is an integer number (87472710).

Almost surely, 2^1242788920 is an apocalyptic number.

1242788920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242788920 is an abundant number, since it is smaller than the sum of its proper divisors (1556337800).

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

1242788920 is a wasteful number, since it uses less digits than its factorization.

1242788920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31695 (or 31691 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 1242788920 is about 35253.2114849130. The cubic root of 1242788920 is about 1075.1419087944.

The spelling of 1242788920 in words is "one billion, two hundred forty-two million, seven hundred eighty-eight thousand, nine hundred twenty".