31438206 has 40 divisors (see below), whose sum is σ = 71961120. Its totient is φ = 10253952.

The previous prime is 31438189. The next prime is 31438213. The reversal of 31438206 is 60283413.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31438206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5550 + ... + 9678.

It is an arithmetic number, because the mean of its divisors is an integer number (1799028).

Almost surely, 2^31438206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31438206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35980560).

31438206 is an abundant number, since it is smaller than the sum of its proper divisors (40522914).

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

31438206 is a wasteful number, since it uses less digits than its factorization.

31438206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4181 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 31438206 is about 5606.9783306162. The cubic root of 31438206 is about 315.6113298134.

The spelling of 31438206 in words is "thirty-one million, four hundred thirty-eight thousand, two hundred six".