30986217 has 6 divisors (see below), whose sum is σ = 44757882. Its totient is φ = 20657472.

The previous prime is 30986213. The next prime is 30986243. The reversal of 30986217 is 71268903.

It can be written as a sum of positive squares in only one way, i.e., 22553001 + 8433216 = 4749^2 + 2904^2 .

It is not a de Polignac number, because 30986217 - 2² = 30986213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30986213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1721448 + ... + 1721465.

It is an arithmetic number, because the mean of its divisors is an integer number (7459647).

Almost surely, 2^30986217 is an apocalyptic number.

It is an amenable number.

30986217 is a deficient number, since it is larger than the sum of its proper divisors (13771665).

30986217 is a wasteful number, since it uses less digits than its factorization.

30986217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3442919 (or 3442916 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 30986217 is about 5566.5264752806. The cubic root of 30986217 is about 314.0915017251.

The spelling of 30986217 in words is "thirty million, nine hundred eighty-six thousand, two hundred seventeen".