47278021 has 8 divisors (see below), whose sum is σ = 54153920. Its totient is φ = 40432608.

The previous prime is 47278009. The next prime is 47278093. The reversal of 47278021 is 12087274.

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 47278021 - 2¹³ = 47269829 is a prime.

It is a super-2 number, since 2×47278021² = 4470422539352882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47278001) 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, 4191 + ... + 10588.

It is an arithmetic number, because the mean of its divisors is an integer number (6769240).

Almost surely, 2^47278021 is an apocalyptic number.

It is an amenable number.

47278021 is a deficient number, since it is larger than the sum of its proper divisors (6875899).

47278021 is a wasteful number, since it uses less digits than its factorization.

47278021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15243.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 47278021 is about 6875.9014681713. The cubic root of 47278021 is about 361.5927906851.

The spelling of 47278021 in words is "forty-seven million, two hundred seventy-eight thousand, twenty-one".