1375857647 has 4 divisors (see below), whose sum is σ = 1380339576. Its totient is φ = 1371375720.

The previous prime is 1375857641. The next prime is 1375857661. The reversal of 1375857647 is 7467585731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7467585731 = 19697 ⋅379123.

It is a cyclic number.

It is not a de Polignac number, because 1375857647 - 2¹² = 1375853551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375857641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2240504 + ... + 2241117.

It is an arithmetic number, because the mean of its divisors is an integer number (345084894).

Almost surely, 2^1375857647 is an apocalyptic number.

1375857647 is a deficient number, since it is larger than the sum of its proper divisors (4481929).

1375857647 is an equidigital number, since it uses as much as digits as its factorization.

1375857647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4481928.

The product of its digits is 4939200, while the sum is 53.

The square root of 1375857647 is about 37092.5551425080. Note that the first 3 decimals coincide. The cubic root of 1375857647 is about 1112.2211960018.

The spelling of 1375857647 in words is "one billion, three hundred seventy-five million, eight hundred fifty-seven thousand, six hundred forty-seven".