31325406 has 48 divisors (see below), whose sum is σ = 74462976. Its totient is φ = 8755824.

The previous prime is 31325389. The next prime is 31325429. The reversal of 31325406 is 60452313.

It is a happy number.

It is a super-2 number, since 2×31325406² = 1962562122129672, which contains 22 as substring.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 12685 + ... + 14951.

It is an arithmetic number, because the mean of its divisors is an integer number (1551312).

Almost surely, 2^31325406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31325406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37231488).

31325406 is an abundant number, since it is smaller than the sum of its proper divisors (43137570).

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

31325406 is a wasteful number, since it uses less digits than its factorization.

31325406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333 (or 2326 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 31325406 is about 5596.9103977105. The cubic root of 31325406 is about 315.2334072552.

Adding to 31325406 its reverse (60452313), we get a palindrome (91777719).

The spelling of 31325406 in words is "thirty-one million, three hundred twenty-five thousand, four hundred six".