2138749 has 2 divisors, whose sum is σ = 2138750. Its totient is φ = 2138748.

The previous prime is 2138743. The next prime is 2138789. The reversal of 2138749 is 9478312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2059225 + 79524 = 1435^2 + 282^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138749 - 2¹⁹ = 1614461 is a prime.

2138749 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069374 + 1069375.

It is an arithmetic number, because the mean of its divisors is an integer number (1069375).

2^2138749 is an apocalyptic number.

It is an amenable number.

2138749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138749 is an equidigital number, since it uses as much as digits as its factorization.

2138749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 2138749 is about 1462.4462383281. The cubic root of 2138749 is about 128.8407585794.

The spelling of 2138749 in words is "two million, one hundred thirty-eight thousand, seven hundred forty-nine".