19542943 has 4 divisors (see below), whose sum is σ = 22334800. Its totient is φ = 16751088.

The previous prime is 19542923. The next prime is 19542947. The reversal of 19542943 is 34924591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19542943 is a prime.

It is a super-2 number, since 2×19542943² = 763853242202498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19542947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395918 + ... + 1395931.

It is an arithmetic number, because the mean of its divisors is an integer number (5583700).

Almost surely, 2^19542943 is an apocalyptic number.

19542943 is a deficient number, since it is larger than the sum of its proper divisors (2791857).

19542943 is an equidigital number, since it uses as much as digits as its factorization.

19542943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791856.

The product of its digits is 38880, while the sum is 37.

The square root of 19542943 is about 4420.7400964092. The cubic root of 19542943 is about 269.3580680496.

The spelling of 19542943 in words is "nineteen million, five hundred forty-two thousand, nine hundred forty-three".