1238665817 has 8 divisors (see below), whose sum is σ = 1262002560. Its totient is φ = 1215426960.

The previous prime is 1238665763. The next prime is 1238665819. The reversal of 1238665817 is 7185668321.

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 1238665817 - 2¹⁶ = 1238600281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1238665819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328 + ... + 49790.

It is an arithmetic number, because the mean of its divisors is an integer number (157750320).

Almost surely, 2^1238665817 is an apocalyptic number.

It is an amenable number.

1238665817 is a deficient number, since it is larger than the sum of its proper divisors (23336743).

1238665817 is an equidigital number, since it uses as much as digits as its factorization.

1238665817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48943.

The product of its digits is 483840, while the sum is 47.

The square root of 1238665817 is about 35194.6844992252. The cubic root of 1238665817 is about 1073.9516202790.

The spelling of 1238665817 in words is "one billion, two hundred thirty-eight million, six hundred sixty-five thousand, eight hundred seventeen".