1263238257 has 8 divisors (see below), whose sum is σ = 1690580160. Its totient is φ = 839027600.

The previous prime is 1263238253. The next prime is 1263238259. The reversal of 1263238257 is 7528323621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1263238257 - 2² = 1263238253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263238253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781869 + ... + 783482.

It is an arithmetic number, because the mean of its divisors is an integer number (211322520).

Almost surely, 2^1263238257 is an apocalyptic number.

It is an amenable number.

1263238257 is a deficient number, since it is larger than the sum of its proper divisors (427341903).

1263238257 is a wasteful number, since it uses less digits than its factorization.

1263238257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565623.

The product of its digits is 120960, while the sum is 39.

The square root of 1263238257 is about 35542.0632068539. The cubic root of 1263238257 is about 1081.0067934980.

The spelling of 1263238257 in words is "one billion, two hundred sixty-three million, two hundred thirty-eight thousand, two hundred fifty-seven".