47640837 has 4 divisors (see below), whose sum is σ = 63521120. Its totient is φ = 31760556.

The previous prime is 47640833. The next prime is 47640863. The reversal of 47640837 is 73804674.

It is a happy number.

47640837 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 47640837 - 2² = 47640833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47640795 and 47640804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47640833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7940137 + ... + 7940142.

It is an arithmetic number, because the mean of its divisors is an integer number (15880280).

Almost surely, 2^47640837 is an apocalyptic number.

It is an amenable number.

47640837 is a deficient number, since it is larger than the sum of its proper divisors (15880283).

47640837 is a wasteful number, since it uses less digits than its factorization.

47640837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15880282.

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 47640837 is about 6902.2342035025. The cubic root of 47640837 is about 362.5154003762.

The spelling of 47640837 in words is "forty-seven million, six hundred forty thousand, eight hundred thirty-seven".