30909938 has 8 divisors (see below), whose sum is σ = 46388700. Its totient is φ = 15447040.

The previous prime is 30909889. The next prime is 30909959. The reversal of 30909938 is 83990903.

It can be written as a sum of positive squares in 2 ways, for example, as 29626249 + 1283689 = 5443^2 + 1133^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 30909895 and 30909904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4658 + ... + 9138.

Almost surely, 2^30909938 is an apocalyptic number.

30909938 is a deficient number, since it is larger than the sum of its proper divisors (15478762).

30909938 is a wasteful number, since it uses less digits than its factorization.

30909938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7932.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 30909938 is about 5559.6706737000. The cubic root of 30909938 is about 313.8335561546.

The spelling of 30909938 in words is "thirty million, nine hundred nine thousand, nine hundred thirty-eight".