31103406 has 64 divisors (see below), whose sum is σ = 73267200. Its totient is φ = 9760608.

The previous prime is 31103381. The next prime is 31103417. The reversal of 31103406 is 60430113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97960 + ... + 98276.

It is an arithmetic number, because the mean of its divisors is an integer number (1144800).

Almost surely, 2^31103406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31103406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36633600).

31103406 is an abundant number, since it is smaller than the sum of its proper divisors (42163794).

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

31103406 is a wasteful number, since it uses less digits than its factorization.

31103406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31103406 is about 5577.0427647634. The cubic root of 31103406 is about 314.4869653371.

Adding to 31103406 its reverse (60430113), we get a palindrome (91533519).

The spelling of 31103406 in words is "thirty-one million, one hundred three thousand, four hundred six".