19813942 has 8 divisors (see below), whose sum is σ = 31469256. Its totient is φ = 9324192.

The previous prime is 19813933. The next prime is 19813943. The reversal of 19813942 is 24931891.

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

It is a super-3 number, since 3×19813942³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19813943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291348 + ... + 291415.

It is an arithmetic number, because the mean of its divisors is an integer number (3933657).

Almost surely, 2^19813942 is an apocalyptic number.

19813942 is a deficient number, since it is larger than the sum of its proper divisors (11655314).

19813942 is a wasteful number, since it uses less digits than its factorization.

19813942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582782.

The product of its digits is 15552, while the sum is 37.

The square root of 19813942 is about 4451.2854323218. The cubic root of 19813942 is about 270.5974060478.

The spelling of 19813942 in words is "nineteen million, eight hundred thirteen thousand, nine hundred forty-two".