1338855921 has 48 divisors (see below), whose sum is σ = 2180505600. Its totient is φ = 785448576.

The previous prime is 1338855883. The next prime is 1338855953. The reversal of 1338855921 is 1295588331.

1338855921 is a `hidden beast` number, since 13 + 3 + 88 + 559 + 2 + 1 = 666.

It is not a de Polignac number, because 1338855921 - 2⁶ = 1338855857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1338855821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1046160 + ... + 1047438.

It is an arithmetic number, because the mean of its divisors is an integer number (45427200).

Almost surely, 2^1338855921 is an apocalyptic number.

It is an amenable number.

1338855921 is a deficient number, since it is larger than the sum of its proper divisors (841649679).

1338855921 is a wasteful number, since it uses less digits than its factorization.

1338855921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710 (or 1707 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 1338855921 is about 36590.3801702032. The cubic root of 1338855921 is about 1102.1599216420.

The spelling of 1338855921 in words is "one billion, three hundred thirty-eight million, eight hundred fifty-five thousand, nine hundred twenty-one".