1539389 has 2 divisors, whose sum is σ = 1539390. Its totient is φ = 1539388.

The previous prime is 1539359. The next prime is 1539397. The reversal of 1539389 is 9839351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1304164 + 235225 = 1142^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1539389 - 2¹² = 1535293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1539359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769694 + 769695.

It is an arithmetic number, because the mean of its divisors is an integer number (769695).

2^1539389 is an apocalyptic number.

It is an amenable number.

1539389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1539389 is an equidigital number, since it uses as much as digits as its factorization.

1539389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 1539389 is about 1240.7211612607. The cubic root of 1539389 is about 115.4647606493.

Subtracting from 1539389 its sum of digits (38), we obtain a palindrome (1539351).

The spelling of 1539389 in words is "one million, five hundred thirty-nine thousand, three hundred eighty-nine".