47820139 has 4 divisors (see below), whose sum is σ = 47852224. Its totient is φ = 47788056.

The previous prime is 47820107. The next prime is 47820163. The reversal of 47820139 is 93102874.

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 47820139 - 2⁵ = 47820107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47820239) 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, 13692 + ... + 16825.

It is an arithmetic number, because the mean of its divisors is an integer number (11963056).

Almost surely, 2^47820139 is an apocalyptic number.

47820139 is a deficient number, since it is larger than the sum of its proper divisors (32085).

47820139 is a wasteful number, since it uses less digits than its factorization.

47820139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32084.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 47820139 is about 6915.2106981639. The cubic root of 47820139 is about 362.9696210667.

The spelling of 47820139 in words is "forty-seven million, eight hundred twenty thousand, one hundred thirty-nine".