1338355257 has 8 divisors (see below), whose sum is σ = 1862059584. Its totient is φ = 853443888.

The previous prime is 1338355253. The next prime is 1338355261. The reversal of 1338355257 is 7525538331.

It is an interprime number because it is at equal distance from previous prime (1338355253) and next prime (1338355261).

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

It is not a de Polignac number, because 1338355257 - 2² = 1338355253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1338355253) 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, 9698158 + ... + 9698295.

It is an arithmetic number, because the mean of its divisors is an integer number (232757448).

Almost surely, 2^1338355257 is an apocalyptic number.

It is an amenable number.

1338355257 is a deficient number, since it is larger than the sum of its proper divisors (523704327).

1338355257 is a wasteful number, since it uses less digits than its factorization.

1338355257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19396479.

The product of its digits is 378000, while the sum is 42.

The square root of 1338355257 is about 36583.5380601713. The cubic root of 1338355257 is about 1102.0225206008.

The spelling of 1338355257 in words is "one billion, three hundred thirty-eight million, three hundred fifty-five thousand, two hundred fifty-seven".