19943427 has 8 divisors (see below), whose sum is σ = 30390016. Its totient is φ = 11396232.

The previous prime is 19943419. The next prime is 19943437. The reversal of 19943427 is 72434991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19943427 - 2³ = 19943419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19943437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474823 + ... + 474864.

It is an arithmetic number, because the mean of its divisors is an integer number (3798752).

Almost surely, 2^19943427 is an apocalyptic number.

19943427 is a deficient number, since it is larger than the sum of its proper divisors (10446589).

19943427 is an equidigital number, since it uses as much as digits as its factorization.

19943427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949697.

The product of its digits is 54432, while the sum is 39.

The square root of 19943427 is about 4465.8064221370. The cubic root of 19943427 is about 271.1855820469.

The spelling of 19943427 in words is "nineteen million, nine hundred forty-three thousand, four hundred twenty-seven".