1263984657 has 16 divisors (see below), whose sum is σ = 1816438848. Its totient is φ = 777199680.

The previous prime is 1263984647. The next prime is 1263984661. The reversal of 1263984657 is 7564893621.

It is not a de Polignac number, because 1263984657 - 2¹² = 1263980561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263984647) 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 15 ways as a sum of consecutive naturals, for example, 37407 + ... + 62667.

It is an arithmetic number, because the mean of its divisors is an integer number (113527428).

Almost surely, 2^1263984657 is an apocalyptic number.

It is an amenable number.

1263984657 is a deficient number, since it is larger than the sum of its proper divisors (552454191).

1263984657 is a wasteful number, since it uses less digits than its factorization.

1263984657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26560.

The product of its digits is 2177280, while the sum is 51.

The square root of 1263984657 is about 35552.5618908118. The cubic root of 1263984657 is about 1081.2196603379.

The spelling of 1263984657 in words is "one billion, two hundred sixty-three million, nine hundred eighty-four thousand, six hundred fifty-seven".