31338630 has 64 divisors (see below), whose sum is σ = 85855680. Its totient is φ = 8128512.

The previous prime is 31338623. The next prime is 31338649. The reversal of 31338630 is 3683313.

It is a super-3 number, since 3×31338630³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31338594 and 31338603.

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, 8422 + ... + 11558.

It is an arithmetic number, because the mean of its divisors is an integer number (1341495).

Almost surely, 2^31338630 is an apocalyptic number.

31338630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31338630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42927840).

31338630 is an abundant number, since it is smaller than the sum of its proper divisors (54517050).

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

31338630 is a wasteful number, since it uses less digits than its factorization.

31338630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3190 (or 3184 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 31338630 is about 5598.0916391213. The cubic root of 31338630 is about 315.2777595414.

The spelling of 31338630 in words is "thirty-one million, three hundred thirty-eight thousand, six hundred thirty".