1539397 has 2 divisors, whose sum is σ = 1539398. Its totient is φ = 1539396.

The previous prime is 1539389. The next prime is 1539403. The reversal of 1539397 is 7939351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1522756 + 16641 = 1234^2 + 129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1539397 - 2³ = 1539389 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1539347) 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 as a sum of consecutive naturals, namely, 769698 + 769699.

It is an arithmetic number, because the mean of its divisors is an integer number (769699).

2^1539397 is an apocalyptic number.

It is an amenable number.

1539397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1539397 is an equidigital number, since it uses as much as digits as its factorization.

1539397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515, while the sum is 37.

The square root of 1539397 is about 1240.7243851879. The cubic root of 1539397 is about 115.4649606673.

It can be divided in two parts, 1539 and 397, that added together give a square (1936 = 44²).

The spelling of 1539397 in words is "one million, five hundred thirty-nine thousand, three hundred ninety-seven".