31918477438 has 8 divisors (see below), whose sum is σ = 48254706432. Its totient is φ = 15833575296.

The previous prime is 31918477433. The next prime is 31918477453. The reversal of 31918477438 is 83477481913.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31918477433) 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, 62831395 + ... + 62831902.

It is an arithmetic number, because the mean of its divisors is an integer number (6031838304).

Almost surely, 2^31918477438 is an apocalyptic number.

31918477438 is a deficient number, since it is larger than the sum of its proper divisors (16336228994).

31918477438 is a wasteful number, since it uses less digits than its factorization.

31918477438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125663426.

The product of its digits is 4064256, while the sum is 55.

The spelling of 31918477438 in words is "thirty-one billion, nine hundred eighteen million, four hundred seventy-seven thousand, four hundred thirty-eight".