2147823 has 8 divisors (see below), whose sum is σ = 3182000. Its totient is φ = 1431864.

The previous prime is 2147801. The next prime is 2147839. The reversal of 2147823 is 3287412.

It is not a de Polignac number, because 2147823 - 2²⁰ = 1099247 is a prime.

It is a super-2 number, since 2×2147823² = 9226287278658, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 79549 = 2147823 / (2 + 1 + 4 + 7 + 8 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2147843) 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, 39748 + ... + 39801.

It is an arithmetic number, because the mean of its divisors is an integer number (397750).

2^2147823 is an apocalyptic number.

2147823 is a deficient number, since it is larger than the sum of its proper divisors (1034177).

2147823 is an equidigital number, since it uses as much as digits as its factorization.

2147823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79558 (or 79552 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 2147823 is about 1465.5452910095. The cubic root of 2147823 is about 129.0227109825.

The spelling of 2147823 in words is "two million, one hundred forty-seven thousand, eight hundred twenty-three".