1242861776 has 80 divisors (see below), whose sum is σ = 2641237200. Its totient is φ = 563134464.

The previous prime is 1242861761. The next prime is 1242861793. The reversal of 1242861776 is 6771682421.

It can be written as a sum of positive squares in 8 ways, for example, as 61152400 + 1181709376 = 7820^2 + 34376^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4620170 + ... + 4620438.

It is an arithmetic number, because the mean of its divisors is an integer number (33015465).

Almost surely, 2^1242861776 is an apocalyptic number.

1242861776 is a gapful number since it is divisible by the number (16) 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 1242861776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320618600).

1242861776 is an abundant number, since it is smaller than the sum of its proper divisors (1398375424).

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

1242861776 is a wasteful number, since it uses less digits than its factorization.

1242861776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 610 counting only the distinct ones).

The product of its digits is 225792, while the sum is 44.

The square root of 1242861776 is about 35254.2447940670. The cubic root of 1242861776 is about 1075.1629177277.

The spelling of 1242861776 in words is "one billion, two hundred forty-two million, eight hundred sixty-one thousand, seven hundred seventy-six".