1375389 has 6 divisors (see below), whose sum is σ = 1986686. Its totient is φ = 916920.

The previous prime is 1375379. The next prime is 1375411. The reversal of 1375389 is 9835731.

It can be written as a sum of positive squares in only one way, i.e., 1172889 + 202500 = 1083^2 + 450^2 .

It is not a de Polignac number, because 1375389 - 2⁴ = 1375373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76402 + ... + 76419.

2^1375389 is an apocalyptic number.

It is an amenable number.

1375389 is a deficient number, since it is larger than the sum of its proper divisors (611297).

1375389 is a wasteful number, since it uses less digits than its factorization.

1375389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152827 (or 152824 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 1375389 is about 1172.7697983833. The cubic root of 1375389 is about 111.2094899428.

It can be divided in two parts, 1375 and 389, that added together give a square (1764 = 42²).

The spelling of 1375389 in words is "one million, three hundred seventy-five thousand, three hundred eighty-nine".