2129657 has 4 divisors (see below), whose sum is σ = 2144100. Its totient is φ = 2115216.

The previous prime is 2129627. The next prime is 2129671. The reversal of 2129657 is 7569212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87616 + 2042041 = 296^2 + 1429^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129657 - 2⁸ = 2129401 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6998 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (536025).

2^2129657 is an apocalyptic number.

It is an amenable number.

2129657 is a deficient number, since it is larger than the sum of its proper divisors (14443).

2129657 is a wasteful number, since it uses less digits than its factorization.

2129657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14442.

The product of its digits is 7560, while the sum is 32.

The square root of 2129657 is about 1459.3344373378. The cubic root of 2129657 is about 128.6579283293.

The spelling of 2129657 in words is "two million, one hundred twenty-nine thousand, six hundred fifty-seven".