30782939 has 4 divisors (see below), whose sum is σ = 33581400. Its totient is φ = 27984480.

The previous prime is 30782929. The next prime is 30782951. The reversal of 30782939 is 93928703.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30782939 - 2¹⁶ = 30717403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30782896 and 30782905.

It is not an unprimeable number, because it can be changed into a prime (30782929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399214 + ... + 1399235.

It is an arithmetic number, because the mean of its divisors is an integer number (8395350).

Almost surely, 2^30782939 is an apocalyptic number.

30782939 is a deficient number, since it is larger than the sum of its proper divisors (2798461).

30782939 is a wasteful number, since it uses less digits than its factorization.

30782939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798460.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 30782939 is about 5548.2374678811. The cubic root of 30782939 is about 313.4031524157.

The spelling of 30782939 in words is "thirty million, seven hundred eighty-two thousand, nine hundred thirty-nine".