30172140 has 36 divisors (see below), whose sum is σ = 91522704. Its totient is φ = 8045856.

The previous prime is 30172139. The next prime is 30172147. The reversal of 30172140 is 4127103.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (30172147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83632 + ... + 83991.

Almost surely, 2^30172140 is an apocalyptic number.

30172140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30172140 is an abundant number, since it is smaller than the sum of its proper divisors (61350564).

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

30172140 is a wasteful number, since it uses less digits than its factorization.

30172140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167638 (or 167633 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 30172140 is about 5492.9172577056. The cubic root of 30172140 is about 311.3164274922.

Adding to 30172140 its reverse (4127103), we get a palindrome (34299243).

The spelling of 30172140 in words is "thirty million, one hundred seventy-two thousand, one hundred forty".