31994338 has 4 divisors (see below), whose sum is σ = 47991510. Its totient is φ = 15997168.

The previous prime is 31994329. The next prime is 31994353. The reversal of 31994338 is 83349913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83349913 = 617 ⋅135089.

It can be written as a sum of positive squares in only one way, i.e., 18429849 + 13564489 = 4293^2 + 3683^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31994338.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7998583 + ... + 7998586.

Almost surely, 2^31994338 is an apocalyptic number.

31994338 is a deficient number, since it is larger than the sum of its proper divisors (15997172).

31994338 is a wasteful number, since it uses less digits than its factorization.

31994338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15997171.

The product of its digits is 69984, while the sum is 40.

The square root of 31994338 is about 5656.3537725287. The cubic root of 31994338 is about 317.4614845709.

The spelling of 31994338 in words is "thirty-one million, nine hundred ninety-four thousand, three hundred thirty-eight".