1538989 has 2 divisors, whose sum is σ = 1538990. Its totient is φ = 1538988.

The previous prime is 1538983. The next prime is 1539011. The reversal of 1538989 is 9898351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1340964 + 198025 = 1158^2 + 445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1538989 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 (1538983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769494 + 769495.

It is an arithmetic number, because the mean of its divisors is an integer number (769495).

2^1538989 is an apocalyptic number.

It is an amenable number.

1538989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538989 is an equidigital number, since it uses as much as digits as its factorization.

1538989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 1538989 is about 1240.5599542142. The cubic root of 1538989 is about 115.4547588661.

The spelling of 1538989 in words is "one million, five hundred thirty-eight thousand, nine hundred eighty-nine".