1242261888 has 128 divisors (see below), whose sum is σ = 3851781120. Its totient is φ = 347344896.

The previous prime is 1242261871. The next prime is 1242261949. The reversal of 1242261888 is 8881622421.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 121420 + ... + 131252.

It is an arithmetic number, because the mean of its divisors is an integer number (30092040).

Almost surely, 2^1242261888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242261888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1925890560).

1242261888 is an abundant number, since it is smaller than the sum of its proper divisors (2609519232).

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

1242261888 is an equidigital number, since it uses as much as digits as its factorization.

1242261888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9904 (or 9892 counting only the distinct ones).

The product of its digits is 98304, while the sum is 42.

The square root of 1242261888 is about 35245.7357420724. The cubic root of 1242261888 is about 1074.9899081079.

The spelling of 1242261888 in words is "one billion, two hundred forty-two million, two hundred sixty-one thousand, eight hundred eighty-eight".