2129399 has 2 divisors, whose sum is σ = 2129400. Its totient is φ = 2129398.

The previous prime is 2129389. The next prime is 2129401. The reversal of 2129399 is 9939212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2129399 - 2¹⁶ = 2063863 is a prime.

Together with 2129401, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2⁷ + 1 + 2¹¹ + 9³ + 3¹³ + 9³ + 9⁶ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2129329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064699 + 1064700.

It is an arithmetic number, because the mean of its divisors is an integer number (1064700).

2^2129399 is an apocalyptic number.

2129399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129399 is an equidigital number, since it uses as much as digits as its factorization.

2129399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 2129399 is about 1459.2460381992. The cubic root of 2129399 is about 128.6527326435.

The spelling of 2129399 in words is "two million, one hundred twenty-nine thousand, three hundred ninety-nine".