15640434142 has 8 divisors (see below), whose sum is σ = 23480519832. Its totient is φ = 7813594200.

The previous prime is 15640434127. The next prime is 15640434149. The reversal of 15640434142 is 24143404651.

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

It is a junction number, because it is equal to n+sod(n) for n = 15640434098 and 15640434107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15640434149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3308484 + ... + 3313207.

It is an arithmetic number, because the mean of its divisors is an integer number (2935064979).

Almost surely, 2^15640434142 is an apocalyptic number.

15640434142 is a deficient number, since it is larger than the sum of its proper divisors (7840085690).

15640434142 is a wasteful number, since it uses less digits than its factorization.

15640434142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622874.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 15640434142 its reverse (24143404651), we get a palindrome (39783838793).

The spelling of 15640434142 in words is "fifteen billion, six hundred forty million, four hundred thirty-four thousand, one hundred forty-two".