30909040 has 20 divisors (see below), whose sum is σ = 71863704. Its totient is φ = 12363584.

The previous prime is 30909031. The next prime is 30909049. The reversal of 30909040 is 4090903.

It is an interprime number because it is at equal distance from previous prime (30909031) and next prime (30909049).

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 30908996 and 30909014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30909049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193102 + ... + 193261.

Almost surely, 2^30909040 is an apocalyptic number.

It is an amenable number.

30909040 is an abundant number, since it is smaller than the sum of its proper divisors (40954664).

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

30909040 is a wasteful number, since it uses less digits than its factorization.

30909040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386376 (or 386370 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 30909040 is about 5559.5899129342. The cubic root of 30909040 is about 313.8305169459.

Adding to 30909040 its reverse (4090903), we get a palindrome (34999943).

The spelling of 30909040 in words is "thirty million, nine hundred nine thousand, forty".