30447972 has 18 divisors (see below), whose sum is σ = 76965798. Its totient is φ = 10149312.

The previous prime is 30447971. The next prime is 30447973. The reversal of 30447972 is 27974403.

It is an interprime number because it is at equal distance from previous prime (30447971) and next prime (30447973).

It can be written as a sum of positive squares in only one way, i.e., 29419776 + 1028196 = 5424^2 + 1014^2 .

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: 845777 = 30447972 / (3 + 0 + 4 + 4 + 7 + 9 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (30447971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 422853 + ... + 422924.

Almost surely, 2^30447972 is an apocalyptic number.

It is an amenable number.

30447972 is an abundant number, since it is smaller than the sum of its proper divisors (46517826).

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

30447972 is a wasteful number, since it uses less digits than its factorization.

30447972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845787 (or 845782 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 30447972 is about 5517.9681042935. The cubic root of 30447972 is about 312.2622302289.

The spelling of 30447972 in words is "thirty million, four hundred forty-seven thousand, nine hundred seventy-two".