1623543 has 4 divisors (see below), whose sum is σ = 2164728. Its totient is φ = 1082360.

The previous prime is 1623539. The next prime is 1623553. The reversal of 1623543 is 3453261.

It is a happy number.

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 1623543 - 2² = 1623539 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623533) 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, 270588 + ... + 270593.

It is an arithmetic number, because the mean of its divisors is an integer number (541182).

2^1623543 is an apocalyptic number.

1623543 is a deficient number, since it is larger than the sum of its proper divisors (541185).

1623543 is an equidigital number, since it uses as much as digits as its factorization.

1623543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541184.

The product of its digits is 2160, while the sum is 24.

The square root of 1623543 is about 1274.1832678230. The cubic root of 1623543 is about 117.5315864983.

The spelling of 1623543 in words is "one million, six hundred twenty-three thousand, five hundred forty-three".