1238888981 has 8 divisors (see below), whose sum is σ = 1368624000. Its totient is φ = 1112005440.

The previous prime is 1238888969. The next prime is 1238889007. The reversal of 1238888981 is 1898888321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1238888981 is a prime.

It is a super-2 number, since 2×1238888981² = 3069691814486436722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238888881) 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, 711956 + ... + 713693.

It is an arithmetic number, because the mean of its divisors is an integer number (171078000).

Almost surely, 2^1238888981 is an apocalyptic number.

1238888981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1238888981 is a deficient number, since it is larger than the sum of its proper divisors (129735019).

1238888981 is a wasteful number, since it uses less digits than its factorization.

1238888981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425739.

The product of its digits is 1769472, while the sum is 56.

The square root of 1238888981 is about 35197.8547783810. The cubic root of 1238888981 is about 1074.0161125050.

The spelling of 1238888981 in words is "one billion, two hundred thirty-eight million, eight hundred eighty-eight thousand, nine hundred eighty-one".