1242609856 has 28 divisors (see below), whose sum is σ = 2507604840. Its totient is φ = 610772480.

The previous prime is 1242609853. The next prime is 1242609871. The reversal of 1242609856 is 6589062421.

It is not an unprimeable number, because it can be changed into a prime (1242609853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160765 + ... + 168316.

Almost surely, 2^1242609856 is an apocalyptic number.

1242609856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1242609856 is an abundant number, since it is smaller than the sum of its proper divisors (1264994984).

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

1242609856 is an equidigital number, since it uses as much as digits as its factorization.

1242609856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329152 (or 329142 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1242609856 is about 35250.6717099121. The cubic root of 1242609856 is about 1075.0902699751.

The spelling of 1242609856 in words is "one billion, two hundred forty-two million, six hundred nine thousand, eight hundred fifty-six".