2109947 has 8 divisors (see below), whose sum is σ = 2420736. Its totient is φ = 1801512.

The previous prime is 2109941. The next prime is 2109949. The reversal of 2109947 is 7499012.

2109947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2109947 - 2¹⁶ = 2044411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2109941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2288 + ... + 3074.

It is an arithmetic number, because the mean of its divisors is an integer number (302592).

2^2109947 is an apocalyptic number.

2109947 is a deficient number, since it is larger than the sum of its proper divisors (310789).

2109947 is an equidigital number, since it uses as much as digits as its factorization.

2109947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2109947 is about 1452.5656611665. The cubic root of 2109947 is about 128.2597873233.

The spelling of 2109947 in words is "two million, one hundred nine thousand, nine hundred forty-seven".