30942172 has 6 divisors (see below), whose sum is σ = 54148808. Its totient is φ = 15471084.

The previous prime is 30942169. The next prime is 30942173. The reversal of 30942172 is 27124903.

It is a self number, because there is not a number n which added to its sum of digits gives 30942172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30942173) 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 as a sum of consecutive naturals, namely, 3867768 + ... + 3867775.

Almost surely, 2^30942172 is an apocalyptic number.

It is an amenable number.

30942172 is a deficient number, since it is larger than the sum of its proper divisors (23206636).

30942172 is a wasteful number, since it uses less digits than its factorization.

30942172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7735547 (or 7735545 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 30942172 is about 5562.5688310348. The cubic root of 30942172 is about 313.9426105781.

The spelling of 30942172 in words is "thirty million, nine hundred forty-two thousand, one hundred seventy-two".