30949987 has 4 divisors (see below), whose sum is σ = 30961216. Its totient is φ = 30938760.

The previous prime is 30949969. The next prime is 30949991. The reversal of 30949987 is 78994903.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 30949987 - 2⁷ = 30949859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30949987.

It is not an unprimeable number, because it can be changed into a prime (30949937) 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 3 ways as a sum of consecutive naturals, for example, 1678 + ... + 8044.

It is an arithmetic number, because the mean of its divisors is an integer number (7740304).

Almost surely, 2^30949987 is an apocalyptic number.

30949987 is a deficient number, since it is larger than the sum of its proper divisors (11229).

30949987 is an equidigital number, since it uses as much as digits as its factorization.

30949987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11228.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 30949987 is about 5563.2712499032. The cubic root of 30949987 is about 313.9690389639.

The spelling of 30949987 in words is "thirty million, nine hundred forty-nine thousand, nine hundred eighty-seven".