1238778767 has 2 divisors, whose sum is σ = 1238778768. Its totient is φ = 1238778766.

The previous prime is 1238778757. The next prime is 1238778769. The reversal of 1238778767 is 7678778321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1238778767 - 2³⁰ = 165036943 is a prime.

Together with 1238778769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238778769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619389383 + 619389384.

It is an arithmetic number, because the mean of its divisors is an integer number (619389384).

Almost surely, 2^1238778767 is an apocalyptic number.

1238778767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238778767 is an equidigital number, since it uses as much as digits as its factorization.

1238778767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5531904, while the sum is 56.

The square root of 1238778767 is about 35196.2891083705. The cubic root of 1238778767 is about 1073.9842626987.

The spelling of 1238778767 in words is "one billion, two hundred thirty-eight million, seven hundred seventy-eight thousand, seven hundred sixty-seven".