2187929 has 2 divisors, whose sum is σ = 2187930. Its totient is φ = 2187928.

The previous prime is 2187919. The next prime is 2187943. The reversal of 2187929 is 9297812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2181529 + 6400 = 1477^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187929 - 2¹² = 2183833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2187892 and 2187901.

It is not a weakly prime, because it can be changed into another prime (2187919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093964 + 1093965.

It is an arithmetic number, because the mean of its divisors is an integer number (1093965).

2^2187929 is an apocalyptic number.

It is an amenable number.

2187929 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187929 is an equidigital number, since it uses as much as digits as its factorization.

2187929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 2187929 is about 1479.1649671352. The cubic root of 2187929 is about 129.8208380105.

The spelling of 2187929 in words is "two million, one hundred eighty-seven thousand, nine hundred twenty-nine".