2129691 has 8 divisors (see below), whose sum is σ = 2989120. Its totient is φ = 1345032.

The previous prime is 2129689. The next prime is 2129713. The reversal of 2129691 is 1969212.

It is a happy number.

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

It is not a de Polignac number, because 2129691 - 2¹ = 2129689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129671) 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, 18625 + ... + 18738.

It is an arithmetic number, because the mean of its divisors is an integer number (373640).

2^2129691 is an apocalyptic number.

2129691 is a deficient number, since it is larger than the sum of its proper divisors (859429).

2129691 is a wasteful number, since it uses less digits than its factorization.

2129691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37385.

The product of its digits is 1944, while the sum is 30.

The square root of 2129691 is about 1459.3460864373. The cubic root of 2129691 is about 128.6586130008.

The spelling of 2129691 in words is "two million, one hundred twenty-nine thousand, six hundred ninety-one".