1375669 has 2 divisors, whose sum is σ = 1375670. Its totient is φ = 1375668.

The previous prime is 1375639. The next prime is 1375679. The reversal of 1375669 is 9665731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1238769 + 136900 = 1113^2 + 370^2 .

It is an emirp because it is prime and its reverse (9665731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1375669 - 2⁵ = 1375637 is a prime.

It is a super-2 number, since 2×1375669² = 3784930395122, which contains 22 as substring.

1375669 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1375609) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687834 + 687835.

It is an arithmetic number, because the mean of its divisors is an integer number (687835).

2^1375669 is an apocalyptic number.

It is an amenable number.

1375669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375669 is an equidigital number, since it uses as much as digits as its factorization.

1375669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 37.

The square root of 1375669 is about 1172.8891678245. The cubic root of 1375669 is about 111.2170360611.

The spelling of 1375669 in words is "one million, three hundred seventy-five thousand, six hundred sixty-nine".