1623643 has 8 divisors (see below), whose sum is σ = 1868288. Its totient is φ = 1382184.

The previous prime is 1623631. The next prime is 1623647. The reversal of 1623643 is 3463261.

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 1623643 - 2¹⁷ = 1492571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623647) 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, 430 + ... + 1852.

It is an arithmetic number, because the mean of its divisors is an integer number (233536).

2^1623643 is an apocalyptic number.

1623643 is a deficient number, since it is larger than the sum of its proper divisors (244645).

1623643 is a wasteful number, since it uses less digits than its factorization.

1623643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593.

The product of its digits is 2592, while the sum is 25.

The square root of 1623643 is about 1274.2225080417. Note that the first 3 decimals coincide. The cubic root of 1623643 is about 117.5339995167.

The spelling of 1623643 in words is "one million, six hundred twenty-three thousand, six hundred forty-three".