30471945 has 16 divisors (see below), whose sum is σ = 55720320. Its totient is φ = 13929984.

The previous prime is 30471943. The next prime is 30471967. The reversal of 30471945 is 54917403.

It is not a de Polignac number, because 30471945 - 2¹ = 30471943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30471943) 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 15 ways as a sum of consecutive naturals, for example, 145000 + ... + 145209.

It is an arithmetic number, because the mean of its divisors is an integer number (3482520).

Almost surely, 2^30471945 is an apocalyptic number.

30471945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30471945 is a deficient number, since it is larger than the sum of its proper divisors (25248375).

30471945 is a wasteful number, since it uses less digits than its factorization.

30471945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290224.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 30471945 is about 5520.1399438782. The cubic root of 30471945 is about 312.3441612319.

The spelling of 30471945 in words is "thirty million, four hundred seventy-one thousand, nine hundred forty-five".