1375638257 has 8 divisors (see below), whose sum is σ = 1640512896. Its totient is φ = 1127852352.

The previous prime is 1375638197. The next prime is 1375638259. The reversal of 1375638257 is 7528365731.

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 1375638257 - 2²⁴ = 1358861041 is a prime.

It is a super-2 number, since 2×1375638257² = 3784761228243996098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375638259) 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, 4272008 + ... + 4272329.

It is an arithmetic number, because the mean of its divisors is an integer number (205064112).

Almost surely, 2^1375638257 is an apocalyptic number.

It is an amenable number.

1375638257 is a deficient number, since it is larger than the sum of its proper divisors (264874639).

1375638257 is an equidigital number, since it uses as much as digits as its factorization.

1375638257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8544367.

The product of its digits is 1058400, while the sum is 47.

The square root of 1375638257 is about 37089.5976926146. The cubic root of 1375638257 is about 1112.1620757433.

The spelling of 1375638257 in words is "one billion, three hundred seventy-five million, six hundred thirty-eight thousand, two hundred fifty-seven".