2138929 has 8 divisors (see below), whose sum is σ = 2360232. Its totient is φ = 1925760.

The previous prime is 2138909. The next prime is 2138971. The reversal of 2138929 is 9298312.

2138929 = 66² + 67² + ... + 188².

It can be written as a sum of positive squares in 4 ways, for example, as 21904 + 2117025 = 148^2 + 1455^2 .

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 2138929 - 2⁵ = 2138897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2138894 and 2138903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138909) 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, 1474 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (295029).

2^2138929 is an apocalyptic number.

It is an amenable number.

2138929 is a deficient number, since it is larger than the sum of its proper divisors (221303).

2138929 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (2138928) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (4067).

2138929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067.

The product of its digits is 7776, while the sum is 34.

The square root of 2138929 is about 1462.5077777571. The cubic root of 2138929 is about 128.8443729486.

The spelling of 2138929 in words is "two million, one hundred thirty-eight thousand, nine hundred twenty-nine".