1238966977 has 4 divisors (see below), whose sum is σ = 1239489280. Its totient is φ = 1238444676.

The previous prime is 1238966959. The next prime is 1238966999. The reversal of 1238966977 is 7796698321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7796698321 = 17 ⋅458629313.

It is a cyclic number.

It is not a de Polignac number, because 1238966977 - 2¹¹ = 1238964929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1238966957) 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 3 ways as a sum of consecutive naturals, for example, 257577 + ... + 262342.

It is an arithmetic number, because the mean of its divisors is an integer number (309872320).

Almost surely, 2^1238966977 is an apocalyptic number.

It is an amenable number.

1238966977 is a deficient number, since it is larger than the sum of its proper divisors (522303).

1238966977 is an equidigital number, since it uses as much as digits as its factorization.

1238966977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522302.

The product of its digits is 6858432, while the sum is 58.

The square root of 1238966977 is about 35198.9627261941. The cubic root of 1238966977 is about 1074.0386507642.

The spelling of 1238966977 in words is "one billion, two hundred thirty-eight million, nine hundred sixty-six thousand, nine hundred seventy-seven".