19942005 has 16 divisors (see below), whose sum is σ = 31967424. Its totient is φ = 10615680.

The previous prime is 19941991. The next prime is 19942009. The reversal of 19942005 is 50024991.

It is a happy number.

It is not a de Polignac number, because 19942005 - 2⁵ = 19941973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19942009) 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 15 ways as a sum of consecutive naturals, for example, 10542 + ... + 12288.

It is an arithmetic number, because the mean of its divisors is an integer number (1997964).

Almost surely, 2^19942005 is an apocalyptic number.

19942005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19942005 is a deficient number, since it is larger than the sum of its proper divisors (12025419).

19942005 is a wasteful number, since it uses less digits than its factorization.

19942005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 19942005 is about 4465.6472095319. The cubic root of 19942005 is about 271.1791365638.

Adding to 19942005 its reverse (50024991), we get a palindrome (69966996).

The spelling of 19942005 in words is "nineteen million, nine hundred forty-two thousand, five".