30172136 has 16 divisors (see below), whose sum is σ = 59032800. Its totient is φ = 14430064.

The previous prime is 30172117. The next prime is 30172139. The reversal of 30172136 is 63127103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (30172139) 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, 81806 + ... + 82173.

It is an arithmetic number, because the mean of its divisors is an integer number (3689550).

Almost surely, 2^30172136 is an apocalyptic number.

It is an amenable number.

30172136 is a deficient number, since it is larger than the sum of its proper divisors (28860664).

30172136 is a wasteful number, since it uses less digits than its factorization.

30172136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164008 (or 164004 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 30172136 is about 5492.9168936003. The cubic root of 30172136 is about 311.3164137349.

Adding to 30172136 its reverse (63127103), we get a palindrome (93299239).

The spelling of 30172136 in words is "thirty million, one hundred seventy-two thousand, one hundred thirty-six".