47720391 has 4 divisors (see below), whose sum is σ = 63627192. Its totient is φ = 31813592.

The previous prime is 47720363. The next prime is 47720401. The reversal of 47720391 is 19302774.

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

It is a cyclic number.

It is not a de Polignac number, because 47720391 - 2⁵ = 47720359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47720311) 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, 7953396 + ... + 7953401.

It is an arithmetic number, because the mean of its divisors is an integer number (15906798).

Almost surely, 2^47720391 is an apocalyptic number.

47720391 is a deficient number, since it is larger than the sum of its proper divisors (15906801).

47720391 is a wasteful number, since it uses less digits than its factorization.

47720391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15906800.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 47720391 is about 6907.9947162690. The cubic root of 47720391 is about 362.7170726815.

The spelling of 47720391 in words is "forty-seven million, seven hundred twenty thousand, three hundred ninety-one".