1242559872 has 256 divisors, whose sum is σ = 3916800000. Its totient is φ = 386684928.

The previous prime is 1242559861. The next prime is 1242559907. The reversal of 1242559872 is 2789552421.

1242559872 is a `hidden beast` number, since 1 + 24 + 2 + 559 + 8 + 72 = 666.

Its product of digits (403200) is a multiple of the sum of its prime divisors (300).

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, 8339254 + ... + 8339402.

It is an arithmetic number, because the mean of its divisors is an integer number (15300000).

Almost surely, 2^1242559872 is an apocalyptic number.

1242559872 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 1242559872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1958400000).

1242559872 is an abundant number, since it is smaller than the sum of its proper divisors (2674240128).

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

1242559872 is a wasteful number, since it uses less digits than its factorization.

1242559872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 300 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 1242559872 is about 35249.9627233845. The cubic root of 1242559872 is about 1075.0758546077.

The spelling of 1242559872 in words is "one billion, two hundred forty-two million, five hundred fifty-nine thousand, eight hundred seventy-two".