1238888881 has 2 divisors, whose sum is σ = 1238888882. Its totient is φ = 1238888880.

The previous prime is 1238888879. The next prime is 1238888887. The reversal of 1238888881 is 1888888321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1226750625 + 12138256 = 35025^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238888881 - 2¹ = 1238888879 is a prime.

It is a super-2 number, since 2×1238888881² = 3069691318930864322, which contains 22 as substring.

Together with 1238888879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1238888887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619444440 + 619444441.

It is an arithmetic number, because the mean of its divisors is an integer number (619444441).

Almost surely, 2^1238888881 is an apocalyptic number.

It is an amenable number.

1238888881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238888881 is an equidigital number, since it uses as much as digits as its factorization.

1238888881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1572864, while the sum is 55.

The square root of 1238888881 is about 35197.8533578399. The cubic root of 1238888881 is about 1074.0160836077.

The spelling of 1238888881 in words is "one billion, two hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-one".