47240321 has 4 divisors (see below), whose sum is σ = 49294272. Its totient is φ = 45186372.

The previous prime is 47240309. The next prime is 47240329. The reversal of 47240321 is 12304274.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47240321 - 2⁶ = 47240257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 2053927 = 47240321 / (4 + 7 + 2 + 4 + 0 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47240329) 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, 1026941 + ... + 1026986.

It is an arithmetic number, because the mean of its divisors is an integer number (12323568).

Almost surely, 2^47240321 is an apocalyptic number.

It is an amenable number.

47240321 is a deficient number, since it is larger than the sum of its proper divisors (2053951).

47240321 is a wasteful number, since it uses less digits than its factorization.

47240321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053950.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 47240321 is about 6873.1594627216. The cubic root of 47240321 is about 361.4966524728.

Adding to 47240321 its reverse (12304274), we get a palindrome (59544595).

The spelling of 47240321 in words is "forty-seven million, two hundred forty thousand, three hundred twenty-one".