31898 has 8 divisors (see below), whose sum is σ = 49140. Its totient is φ = 15520.

The previous prime is 31891. The next prime is 31907. The reversal of 31898 is 89813.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26569 + 5329 = 163^2 + 73^2 .

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

Its product of digits (1728) is a multiple of the sum of its prime divisors (432).

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 31898.

It is not an unprimeable number, because it can be changed into a prime (31891) by changing a digit.

31898 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 276.

2³¹⁸⁹⁸ is an apocalyptic number.

31898 is a deficient number, since it is larger than the sum of its proper divisors (17242).

31898 is a wasteful number, since it uses less digits than its factorization.

31898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 1728, while the sum is 29.

The square root of 31898 is about 178.6001119820. The cubic root of 31898 is about 31.7142528629.

It can be divided in two parts, 31 and 898, that added together give a palindrome (929).

The spelling of 31898 in words is "thirty-one thousand, eight hundred ninety-eight".