1338589681 has 12 divisors (see below), whose sum is σ = 1581251760. Its totient is φ = 1123290480.

The previous prime is 1338589649. The next prime is 1338589687. The reversal of 1338589681 is 1869858331.

It is not a de Polignac number, because 1338589681 - 2⁵ = 1338589649 is a prime.

It is a super-2 number, since 2×1338589681² = 3583644668159363522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1338589687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 358171 + ... + 361888.

It is an arithmetic number, because the mean of its divisors is an integer number (131770980).

Almost surely, 2^1338589681 is an apocalyptic number.

1338589681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1338589681 is a deficient number, since it is larger than the sum of its proper divisors (242662079).

1338589681 is a wasteful number, since it uses less digits than its factorization.

1338589681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720096 (or 720083 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 52.

The square root of 1338589681 is about 36586.7418746190. The cubic root of 1338589681 is about 1102.0868596329.

The spelling of 1338589681 in words is "one billion, three hundred thirty-eight million, five hundred eighty-nine thousand, six hundred eighty-one".