1375865 has 8 divisors (see below), whose sum is σ = 1659528. Its totient is φ = 1095040.

The previous prime is 1375853. The next prime is 1375877. The reversal of 1375865 is 5685731.

It is an interprime number because it is at equal distance from previous prime (1375853) and next prime (1375877).

It can be written as a sum of positive squares in 4 ways, for example, as 218089 + 1157776 = 467^2 + 1076^2 .

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

It is not a de Polignac number, because 1375865 - 2⁸ = 1375609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (207441).

2^1375865 is an apocalyptic number.

It is an amenable number.

1375865 is a deficient number, since it is larger than the sum of its proper divisors (283663).

1375865 is a wasteful number, since it uses less digits than its factorization.

1375865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419.

The product of its digits is 25200, while the sum is 35.

The square root of 1375865 is about 1172.9727192054. The cubic root of 1375865 is about 111.2223177347. Note that the first 3 decimals are identical.

The spelling of 1375865 in words is "one million, three hundred seventy-five thousand, eight hundred sixty-five".