19440642842 has 16 divisors (see below), whose sum is σ = 30917469312. Its totient is φ = 9136344000.

The previous prime is 19440642827. The next prime is 19440642847. The reversal of 19440642842 is 24824604491.

It is a super-2 number, since 2×19440642842² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19440642793 and 19440642802.

It is not an unprimeable number, because it can be changed into a prime (19440642847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355148 + ... + 406215.

It is an arithmetic number, because the mean of its divisors is an integer number (1932341832).

Almost surely, 2^19440642842 is an apocalyptic number.

19440642842 is a deficient number, since it is larger than the sum of its proper divisors (11476826470).

19440642842 is a wasteful number, since it uses less digits than its factorization.

19440642842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762133.

The product of its (nonzero) digits is 442368, while the sum is 44.

The spelling of 19440642842 in words is "nineteen billion, four hundred forty million, six hundred forty-two thousand, eight hundred forty-two".