31989738 has 48 divisors (see below), whose sum is σ = 71053920. Its totient is φ = 9593760.

The previous prime is 31989731. The next prime is 31989761. The reversal of 31989738 is 83798913.

It is not an unprimeable number, because it can be changed into a prime (31989731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100756 + ... + 101072.

It is an arithmetic number, because the mean of its divisors is an integer number (1480290).

Almost surely, 2^31989738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31989738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35526960).

31989738 is an abundant number, since it is smaller than the sum of its proper divisors (39064182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31989738 is a wasteful number, since it uses less digits than its factorization.

31989738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 472 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 31989738 is about 5655.9471355380. The cubic root of 31989738 is about 317.4462694536.

The spelling of 31989738 in words is "thirty-one million, nine hundred eighty-nine thousand, seven hundred thirty-eight".