19812442 has 8 divisors (see below), whose sum is σ = 32004756. Its totient is φ = 9144192.

The previous prime is 19812433. The next prime is 19812451. The reversal of 19812442 is 24421891.

It is an interprime number because it is at equal distance from previous prime (19812433) and next prime (19812451).

It can be written as a sum of positive squares in 2 ways, for example, as 15848361 + 3964081 = 3981^2 + 1991^2 .

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

It is a super-3 number, since 3×19812442³ (a number of 23 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 380983 + ... + 381034.

Almost surely, 2^19812442 is an apocalyptic number.

19812442 is a deficient number, since it is larger than the sum of its proper divisors (12192314).

19812442 is a wasteful number, since it uses less digits than its factorization.

19812442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762032.

The product of its digits is 4608, while the sum is 31.

The square root of 19812442 is about 4451.1169384774. The cubic root of 19812442 is about 270.5905774159.

The spelling of 19812442 in words is "nineteen million, eight hundred twelve thousand, four hundred forty-two".