47640138 has 32 divisors (see below), whose sum is σ = 117269376. Its totient is φ = 12564288.

The previous prime is 47640121. The next prime is 47640179. The reversal of 47640138 is 83104674.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 47640099 and 47640108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43081 + ... + 44172.

It is an arithmetic number, because the mean of its divisors is an integer number (3664668).

Almost surely, 2^47640138 is an apocalyptic number.

47640138 is an abundant number, since it is smaller than the sum of its proper divisors (69629238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47640138 is a wasteful number, since it uses less digits than its factorization.

47640138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87278.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 47640138 is about 6902.1835675386. The cubic root of 47640138 is about 362.5136273910.

The spelling of 47640138 in words is "forty-seven million, six hundred forty thousand, one hundred thirty-eight".