1375645 has 4 divisors (see below), whose sum is σ = 1650780. Its totient is φ = 1100512.

The previous prime is 1375639. The next prime is 1375669. The reversal of 1375645 is 5465731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1012036 + 363609 = 1006^2 + 603^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375645 - 2³ = 1375637 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137560 + ... + 137569.

It is an arithmetic number, because the mean of its divisors is an integer number (412695).

2^1375645 is an apocalyptic number.

It is an amenable number.

1375645 is a deficient number, since it is larger than the sum of its proper divisors (275135).

1375645 is an equidigital number, since it uses as much as digits as its factorization.

1375645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275134.

The product of its digits is 12600, while the sum is 31.

The square root of 1375645 is about 1172.8789366341. The cubic root of 1375645 is about 111.2163892911.

The spelling of 1375645 in words is "one million, three hundred seventy-five thousand, six hundred forty-five".