31930000 has 100 divisors (see below), whose sum is σ = 80574208. Its totient is φ = 12240000.

The previous prime is 31929991. The next prime is 31930057. The reversal of 31930000 is 3913.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 309949 + ... + 310051.

Almost surely, 2^31930000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31930000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40287104).

31930000 is an abundant number, since it is smaller than the sum of its proper divisors (48644208).

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

31930000 is a wasteful number, since it uses less digits than its factorization.

31930000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 31930000 is about 5650.6636778347. The cubic root of 31930000 is about 317.2485454023.

Adding to 31930000 its reverse (3913), we get a palindrome (31933913).

The spelling of 31930000 in words is "thirty-one million, nine hundred thirty thousand".