1268783945 has 16 divisors (see below), whose sum is σ = 1788720192. Its totient is φ = 851770560.

The previous prime is 1268783939. The next prime is 1268783951. The reversal of 1268783945 is 5493878621.

It is an interprime number because it is at equal distance from previous prime (1268783939) and next prime (1268783951).

It is not a de Polignac number, because 1268783945 - 2²⁶ = 1201675081 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 886547 + ... + 887976.

It is an arithmetic number, because the mean of its divisors is an integer number (111795012).

Almost surely, 2^1268783945 is an apocalyptic number.

It is an amenable number.

1268783945 is a deficient number, since it is larger than the sum of its proper divisors (519936247).

1268783945 is a wasteful number, since it uses less digits than its factorization.

1268783945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774552.

The product of its digits is 2903040, while the sum is 53.

The square root of 1268783945 is about 35619.9936131381. The cubic root of 1268783945 is about 1082.5863780863.

The spelling of 1268783945 in words is "one billion, two hundred sixty-eight million, seven hundred eighty-three thousand, nine hundred forty-five".