19699442 has 16 divisors (see below), whose sum is σ = 33855360. Its totient is φ = 8421408.

The previous prime is 19699441. The next prime is 19699453. The reversal of 19699442 is 24499691.

It is a super-2 number, since 2×19699442² = 776136030222728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 19699393 and 19699402.

It is not an unprimeable number, because it can be changed into a prime (19699441) 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 7 ways as a sum of consecutive naturals, for example, 4859 + ... + 7937.

It is an arithmetic number, because the mean of its divisors is an integer number (2115960).

Almost surely, 2^19699442 is an apocalyptic number.

19699442 is a deficient number, since it is larger than the sum of its proper divisors (14155918).

19699442 is a wasteful number, since it uses less digits than its factorization.

19699442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545.

The product of its digits is 139968, while the sum is 44.

The square root of 19699442 is about 4438.4053442650. The cubic root of 19699442 is about 270.0751596886.

It can be divided in two parts, 1969 and 9442, that added together give a palindrome (11411).

The spelling of 19699442 in words is "nineteen million, six hundred ninety-nine thousand, four hundred forty-two".