2123947 has 4 divisors (see below), whose sum is σ = 2427376. Its totient is φ = 1820520.

The previous prime is 2123939. The next prime is 2123969. The reversal of 2123947 is 7493212.

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

It is a cyclic number.

It is not a de Polignac number, because 2123947 - 2³ = 2123939 is a prime.

It is a super-2 number, since 2×2123947² = 9022301717618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2123917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151704 + ... + 151717.

It is an arithmetic number, because the mean of its divisors is an integer number (606844).

2^2123947 is an apocalyptic number.

2123947 is a deficient number, since it is larger than the sum of its proper divisors (303429).

2123947 is an equidigital number, since it uses as much as digits as its factorization.

2123947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303428.

The product of its digits is 3024, while the sum is 28.

The square root of 2123947 is about 1457.3767529366. The cubic root of 2123947 is about 128.5428402634.

The spelling of 2123947 in words is "two million, one hundred twenty-three thousand, nine hundred forty-seven".