31748438 has 4 divisors (see below), whose sum is σ = 47622660. Its totient is φ = 15874218.

The previous prime is 31748407. The next prime is 31748459. The reversal of 31748438 is 83484713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83484713 = 13 ⋅6421901.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7937108 + ... + 7937111.

It is an arithmetic number, because the mean of its divisors is an integer number (11905665).

Almost surely, 2^31748438 is an apocalyptic number.

31748438 is a deficient number, since it is larger than the sum of its proper divisors (15874222).

31748438 is a wasteful number, since it uses less digits than its factorization.

31748438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15874221.

The product of its digits is 64512, while the sum is 38.

The square root of 31748438 is about 5634.5752280008. The cubic root of 31748438 is about 316.6460837345.

The spelling of 31748438 in words is "thirty-one million, seven hundred forty-eight thousand, four hundred thirty-eight".