1242910656 has 140 divisors (see below), whose sum is σ = 3968005272. Its totient is φ = 382413312.

The previous prime is 1242910651. The next prime is 1242910661. The reversal of 1242910656 is 6560192421.

It is an interprime number because it is at equal distance from previous prime (1242910651) and next prime (1242910661).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1242910656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242910651) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 58171 + ... + 76613.

Almost surely, 2^1242910656 is an apocalyptic number.

1242910656 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 1242910656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1984002636).

1242910656 is an abundant number, since it is smaller than the sum of its proper divisors (2725094616).

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

1242910656 is a wasteful number, since it uses less digits than its factorization.

1242910656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18480 (or 18461 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1242910656 is about 35254.9380371034. The cubic root of 1242910656 is about 1075.1770124231.

The spelling of 1242910656 in words is "one billion, two hundred forty-two million, nine hundred ten thousand, six hundred fifty-six".