47920921 has 8 divisors (see below), whose sum is σ = 48857760. Its totient is φ = 46988352.

The previous prime is 47920889. The next prime is 47920969. The reversal of 47920921 is 12902974.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 47920921 - 2⁵ = 47920889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47920981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30081 + ... + 31633.

It is an arithmetic number, because the mean of its divisors is an integer number (6107220).

Almost surely, 2^47920921 is an apocalyptic number.

It is an amenable number.

47920921 is a deficient number, since it is larger than the sum of its proper divisors (936839).

47920921 is a wasteful number, since it uses less digits than its factorization.

47920921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 47920921 is about 6922.4938425397. The cubic root of 47920921 is about 363.2244309779.

It can be divided in two parts, 47920 and 921, that added together give a square (48841 = 221²).

The spelling of 47920921 in words is "forty-seven million, nine hundred twenty thousand, nine hundred twenty-one".