30867981 has 8 divisors (see below), whose sum is σ = 41189280. Its totient is φ = 20562672.

The previous prime is 30867979. The next prime is 30867997. The reversal of 30867981 is 18976803.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30867981 - 2¹ = 30867979 is a prime.

It is a super-2 number, since 2×30867981² = 1905664502032722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30862981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1650 + ... + 8028.

It is an arithmetic number, because the mean of its divisors is an integer number (5148660).

Almost surely, 2^30867981 is an apocalyptic number.

It is an amenable number.

30867981 is a deficient number, since it is larger than the sum of its proper divisors (10321299).

30867981 is a wasteful number, since it uses less digits than its factorization.

30867981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7995.

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

The square root of 30867981 is about 5555.8960573430. The cubic root of 30867981 is about 313.6914931408.

The spelling of 30867981 in words is "thirty million, eight hundred sixty-seven thousand, nine hundred eighty-one".