1539889 has 4 divisors (see below), whose sum is σ = 1658356. Its totient is φ = 1421424.

The previous prime is 1539887. The next prime is 1539913. The reversal of 1539889 is 9889351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9889351 = 2017 ⋅4903.

It can be written as a sum of positive squares in 2 ways, for example, as 119025 + 1420864 = 345^2 + 1192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1539889 - 2¹ = 1539887 is a prime.

It is a Duffinian number.

1539889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1539883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59214 + ... + 59239.

It is an arithmetic number, because the mean of its divisors is an integer number (414589).

2^1539889 is an apocalyptic number.

It is an amenable number.

1539889 is a deficient number, since it is larger than the sum of its proper divisors (118467).

1539889 is a wasteful number, since it uses less digits than its factorization.

1539889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118466.

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

The square root of 1539889 is about 1240.9226406187. The cubic root of 1539889 is about 115.4772604422.

The spelling of 1539889 in words is "one million, five hundred thirty-nine thousand, eight hundred eighty-nine".