47978121 has 8 divisors (see below), whose sum is σ = 64592320. Its totient is φ = 31674672.

The previous prime is 47978107. The next prime is 47978123. The reversal of 47978121 is 12187974.

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

It is not a de Polignac number, because 47978121 - 2⁵ = 47978089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47978121.

It is not an unprimeable number, because it can be changed into a prime (47978123) 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, 77326 + ... + 77943.

It is an arithmetic number, because the mean of its divisors is an integer number (8074040).

Almost surely, 2^47978121 is an apocalyptic number.

It is an amenable number.

47978121 is a deficient number, since it is larger than the sum of its proper divisors (16614199).

47978121 is a wasteful number, since it uses less digits than its factorization.

47978121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155375.

The product of its digits is 28224, while the sum is 39.

The square root of 47978121 is about 6926.6240694872. The cubic root of 47978121 is about 363.3688924226.

The spelling of 47978121 in words is "forty-seven million, nine hundred seventy-eight thousand, one hundred twenty-one".