2138489 has 8 divisors (see below), whose sum is σ = 2273160. Its totient is φ = 2007936.

The previous prime is 2138483. The next prime is 2138491. The reversal of 2138489 is 9848312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1000000 + 1138489 = 1000^2 + 1067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2138489 - 2¹⁶ = 2072953 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 (2138483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77 + ... + 2069.

It is an arithmetic number, because the mean of its divisors is an integer number (284145).

2^2138489 is an apocalyptic number.

2138489 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2138489 is a deficient number, since it is larger than the sum of its proper divisors (134671).

2138489 is a wasteful number, since it uses less digits than its factorization.

2138489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059.

The product of its digits is 13824, while the sum is 35.

The square root of 2138489 is about 1462.3573434698. The cubic root of 2138489 is about 128.8355374657.

The spelling of 2138489 in words is "two million, one hundred thirty-eight thousand, four hundred eighty-nine".