31405423642 has 8 divisors (see below), whose sum is σ = 48627752832. Its totient is φ = 15196172700.

The previous prime is 31405423633. The next prime is 31405423649. The reversal of 31405423642 is 24632450413.

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 = 31405423598 and 31405423607.

It is not an unprimeable number, because it can be changed into a prime (31405423649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253269484 + ... + 253269607.

It is an arithmetic number, because the mean of its divisors is an integer number (6078469104).

Almost surely, 2^31405423642 is an apocalyptic number.

31405423642 is a deficient number, since it is larger than the sum of its proper divisors (17222329190).

31405423642 is a wasteful number, since it uses less digits than its factorization.

31405423642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506539124.

The product of its (nonzero) digits is 69120, while the sum is 34.

The spelling of 31405423642 in words is "thirty-one billion, four hundred five million, four hundred twenty-three thousand, six hundred forty-two".