19942942 has 16 divisors (see below), whose sum is σ = 30466800. Its totient is φ = 9789120.

The previous prime is 19942939. The next prime is 19942957. The reversal of 19942942 is 24924991.

It is a junction number, because it is equal to n+sod(n) for n = 19942895 and 19942904.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 31909 + ... + 32527.

It is an arithmetic number, because the mean of its divisors is an integer number (1904175).

Almost surely, 2^19942942 is an apocalyptic number.

19942942 is a deficient number, since it is larger than the sum of its proper divisors (10523858).

19942942 is a wasteful number, since it uses less digits than its factorization.

19942942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its digits is 46656, while the sum is 40.

The square root of 19942942 is about 4465.7521203040. The cubic root of 19942942 is about 271.1833837274.

It can be divided in two parts, 199 and 42942, that multiplied together give a palindrome (8545458).

The spelling of 19942942 in words is "nineteen million, nine hundred forty-two thousand, nine hundred forty-two".