47238145 has 4 divisors (see below), whose sum is σ = 56685780. Its totient is φ = 37790512.

The previous prime is 47238143. The next prime is 47238193. The reversal of 47238145 is 54183274.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17032129 + 30206016 = 4127^2 + 5496^2 .

It is a cyclic number.

It is not a de Polignac number, because 47238145 - 2¹ = 47238143 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 47238145.

It is not an unprimeable number, because it can be changed into a prime (47238143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4723810 + ... + 4723819.

It is an arithmetic number, because the mean of its divisors is an integer number (14171445).

Almost surely, 2^47238145 is an apocalyptic number.

It is an amenable number.

47238145 is a deficient number, since it is larger than the sum of its proper divisors (9447635).

47238145 is an equidigital number, since it uses as much as digits as its factorization.

47238145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447634.

The product of its digits is 26880, while the sum is 34.

The square root of 47238145 is about 6873.0011639749. The cubic root of 47238145 is about 361.4911019263.

The spelling of 47238145 in words is "forty-seven million, two hundred thirty-eight thousand, one hundred forty-five".