30971886 has 48 divisors (see below), whose sum is σ = 69987792. Its totient is φ = 9123840.

The previous prime is 30971879. The next prime is 30971903. The reversal of 30971886 is 68817903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26286 + ... + 27438.

It is an arithmetic number, because the mean of its divisors is an integer number (1458079).

Almost surely, 2^30971886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30971886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34993896).

30971886 is an abundant number, since it is smaller than the sum of its proper divisors (39015906).

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

30971886 is a wasteful number, since it uses less digits than its factorization.

30971886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 30971886 is about 5565.2390784224. The cubic root of 30971886 is about 314.0430722420.

The spelling of 30971886 in words is "thirty million, nine hundred seventy-one thousand, eight hundred eighty-six".