47640139 has 4 divisors (see below), whose sum is σ = 47658024. Its totient is φ = 47622256.

The previous prime is 47640121. The next prime is 47640179. The reversal of 47640139 is 93104674.

It is a happy number.

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 47640139 - 2¹¹ = 47638091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47640119) 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, 4057 + ... + 10570.

It is an arithmetic number, because the mean of its divisors is an integer number (11914506).

Almost surely, 2^47640139 is an apocalyptic number.

47640139 is a deficient number, since it is larger than the sum of its proper divisors (17885).

47640139 is a wasteful number, since it uses less digits than its factorization.

47640139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17884.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 47640139 is about 6902.1836399795. The cubic root of 47640139 is about 362.5136299275.

The spelling of 47640139 in words is "forty-seven million, six hundred forty thousand, one hundred thirty-nine".