19808942 has 4 divisors (see below), whose sum is σ = 29713416. Its totient is φ = 9904470.

The previous prime is 19808923. The next prime is 19808947. The reversal of 19808942 is 24980891.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19808942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19808947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4952234 + ... + 4952237.

It is an arithmetic number, because the mean of its divisors is an integer number (7428354).

Almost surely, 2^19808942 is an apocalyptic number.

19808942 is a deficient number, since it is larger than the sum of its proper divisors (9904474).

19808942 is an equidigital number, since it uses as much as digits as its factorization.

19808942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9904473.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 19808942 is about 4450.7237613674. The cubic root of 19808942 is about 270.5746426009.

The spelling of 19808942 in words is "nineteen million, eight hundred eight thousand, nine hundred forty-two".