30249972 has 18 divisors (see below), whose sum is σ = 76465298. Its totient is φ = 10083312.

The previous prime is 30249971. The next prime is 30250001. The reversal of 30249972 is 27994203.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 9511056 = 4554^2 + 3084^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 840277 = 30249972 / (3 + 0 + 2 + 4 + 9 + 9 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30249971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420103 + ... + 420174.

Almost surely, 2^30249972 is an apocalyptic number.

It is an amenable number.

30249972 is an abundant number, since it is smaller than the sum of its proper divisors (46215326).

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

30249972 is a wasteful number, since it uses less digits than its factorization.

30249972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840287 (or 840282 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 30249972 is about 5499.9974545449. The cubic root of 30249972 is about 311.5838880824.

It can be divided in two parts, 3024 and 9972, that added together give a square (12996 = 114²).

The spelling of 30249972 in words is "thirty million, two hundred forty-nine thousand, nine hundred seventy-two".