30640938 has 8 divisors (see below), whose sum is σ = 61281888. Its totient is φ = 10213644.

The previous prime is 30640933. The next prime is 30640949. The reversal of 30640938 is 83904603.

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

30640938 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30640899 and 30640908.

It is not an unprimeable number, because it can be changed into a prime (30640931) 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, 2553406 + ... + 2553417.

It is an arithmetic number, because the mean of its divisors is an integer number (7660236).

Almost surely, 2^30640938 is an apocalyptic number.

30640938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

30640938 is a wasteful number, since it uses less digits than its factorization.

30640938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106828.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 30640938 is about 5535.4257288848. The cubic root of 30640938 is about 312.9205022886.

The spelling of 30640938 in words is "thirty million, six hundred forty thousand, nine hundred thirty-eight".