1591389 has 12 divisors (see below), whose sum is σ = 2315872. Its totient is φ = 1053000.

The previous prime is 1591367. The next prime is 1591391. The reversal of 1591389 is 9831951.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1591389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 774 + ... + 1944.

2^1591389 is an apocalyptic number.

It is an amenable number.

1591389 is a deficient number, since it is larger than the sum of its proper divisors (724483).

1591389 is a wasteful number, since it uses less digits than its factorization.

1591389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1325 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1591389 is about 1261.5026753836. The cubic root of 1591389 is about 116.7505093464.

The spelling of 1591389 in words is "one million, five hundred ninety-one thousand, three hundred eighty-nine".