31130406 has 40 divisors (see below), whose sum is σ = 70959240. Its totient is φ = 10197792.

The previous prime is 31130399. The next prime is 31130419. The reversal of 31130406 is 60403113.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7930 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (1773981).

Almost surely, 2^31130406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31130406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35479620).

31130406 is an abundant number, since it is smaller than the sum of its proper divisors (39828834).

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

31130406 is a wasteful number, since it uses less digits than its factorization.

31130406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330 (or 3321 counting only the distinct ones).

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

The square root of 31130406 is about 5579.4628773745. The cubic root of 31130406 is about 314.5779381421.

Adding to 31130406 its reverse (60403113), we get a palindrome (91533519).

The spelling of 31130406 in words is "thirty-one million, one hundred thirty thousand, four hundred six".