1623978443 has 4 divisors (see below), whose sum is σ = 1639745328. Its totient is φ = 1608211560.

The previous prime is 1623978439. The next prime is 1623978487. The reversal of 1623978443 is 3448793261.

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 1623978443 - 2² = 1623978439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623978413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7883288 + ... + 7883493.

It is an arithmetic number, because the mean of its divisors is an integer number (409936332).

Almost surely, 2^1623978443 is an apocalyptic number.

1623978443 is a deficient number, since it is larger than the sum of its proper divisors (15766885).

1623978443 is a wasteful number, since it uses less digits than its factorization.

1623978443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15766884.

The product of its digits is 870912, while the sum is 47.

The square root of 1623978443 is about 40298.6158943456. The cubic root of 1623978443 is about 1175.4209309445.

The spelling of 1623978443 in words is "one billion, six hundred twenty-three million, nine hundred seventy-eight thousand, four hundred forty-three".