1338257521 has 8 divisors (see below), whose sum is σ = 1348812000. Its totient is φ = 1327737600.

The previous prime is 1338257509. The next prime is 1338257563. The reversal of 1338257521 is 1257528331.

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

It is a cyclic number.

It is not a de Polignac number, because 1338257521 - 2⁹ = 1338257009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338257821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72046 + ... + 88696.

It is an arithmetic number, because the mean of its divisors is an integer number (168601500).

Almost surely, 2^1338257521 is an apocalyptic number.

It is an amenable number.

1338257521 is a deficient number, since it is larger than the sum of its proper divisors (10554479).

1338257521 is a wasteful number, since it uses less digits than its factorization.

1338257521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17279.

The product of its digits is 50400, while the sum is 37.

The square root of 1338257521 is about 36582.2022437141. The cubic root of 1338257521 is about 1101.9956941673.

The spelling of 1338257521 in words is "one billion, three hundred thirty-eight million, two hundred fifty-seven thousand, five hundred twenty-one".