31320030 has 32 divisors (see below), whose sum is σ = 85906944. Its totient is φ = 7158816.

The previous prime is 31320011. The next prime is 31320041. The reversal of 31320030 is 3002313.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31319988 and 31320015.

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 15 ways as a sum of consecutive naturals, for example, 74362 + ... + 74781.

It is an arithmetic number, because the mean of its divisors is an integer number (2684592).

Almost surely, 2^31320030 is an apocalyptic number.

31320030 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31320030 is an abundant number, since it is smaller than the sum of its proper divisors (54586914).

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

31320030 is a wasteful number, since it uses less digits than its factorization.

31320030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149160.

The product of its (nonzero) digits is 54, while the sum is 12.

The square root of 31320030 is about 5596.4301121340. The cubic root of 31320030 is about 315.2153729930.

Adding to 31320030 its reverse (3002313), we get a palindrome (34322343).

The spelling of 31320030 in words is "thirty-one million, three hundred twenty thousand, thirty".