1245912640 has 56 divisors (see below), whose sum is σ = 3390668352. Its totient is φ = 427169280.

The previous prime is 1245912623. The next prime is 1245912683. The reversal of 1245912640 is 462195421.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1245912596 and 1245912605.

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 7 ways as a sum of consecutive naturals, for example, 275866 + ... + 280345.

Almost surely, 2^1245912640 is an apocalyptic number.

1245912640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245912640 is an abundant number, since it is smaller than the sum of its proper divisors (2144755712).

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

1245912640 is an equidigital number, since it uses as much as digits as its factorization.

1245912640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556235 (or 556225 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1245912640 is about 35297.4877292988. The cubic root of 1245912640 is about 1076.0419362418.

The spelling of 1245912640 in words is "one billion, two hundred forty-five million, nine hundred twelve thousand, six hundred forty".