1242775872 has 224 divisors, whose sum is σ = 3988978560. Its totient is φ = 381832704.

The previous prime is 1242775867. The next prime is 1242775913. The reversal of 1242775872 is 2785772421.

It is a congruent number.

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, 1819243 + ... + 1819925.

It is an arithmetic number, because the mean of its divisors is an integer number (17807940).

Almost surely, 2^1242775872 is an apocalyptic number.

1242775872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242775872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994489280).

1242775872 is an abundant number, since it is smaller than the sum of its proper divisors (2746202688).

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

1242775872 is an frugal number, since it uses more digits than its factorization.

1242775872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 701 counting only the distinct ones).

The product of its digits is 439040, while the sum is 45.

The square root of 1242775872 is about 35253.0264232732. The cubic root of 1242775872 is about 1075.1381461548.

The spelling of 1242775872 in words is "one billion, two hundred forty-two million, seven hundred seventy-five thousand, eight hundred seventy-two".