47636921 has 4 divisors (see below), whose sum is σ = 48240000. Its totient is φ = 47033844.

The previous prime is 47636909. The next prime is 47636923. The reversal of 47636921 is 12963674.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47636921 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47636923) 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, 301421 + ... + 301578.

It is an arithmetic number, because the mean of its divisors is an integer number (12060000).

Almost surely, 2^47636921 is an apocalyptic number.

It is an amenable number.

47636921 is a deficient number, since it is larger than the sum of its proper divisors (603079).

47636921 is an equidigital number, since it uses as much as digits as its factorization.

47636921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603078.

The product of its digits is 54432, while the sum is 38.

The square root of 47636921 is about 6901.9505214106. The cubic root of 47636921 is about 362.5054673769.

The spelling of 47636921 in words is "forty-seven million, six hundred thirty-six thousand, nine hundred twenty-one".