1375643 has 4 divisors (see below), whose sum is σ = 1404960. Its totient is φ = 1346328.

The previous prime is 1375639. The next prime is 1375669. The reversal of 1375643 is 3465731.

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

It is a cyclic number.

It is not a de Polignac number, because 1375643 - 2² = 1375639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14588 + ... + 14681.

It is an arithmetic number, because the mean of its divisors is an integer number (351240).

2^1375643 is an apocalyptic number.

1375643 is a deficient number, since it is larger than the sum of its proper divisors (29317).

1375643 is an equidigital number, since it uses as much as digits as its factorization.

1375643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29316.

The product of its digits is 7560, while the sum is 29.

The square root of 1375643 is about 1172.8780840309. The cubic root of 1375643 is about 111.2163353933.

The spelling of 1375643 in words is "one million, three hundred seventy-five thousand, six hundred forty-three".