47904021 has 64 divisors (see below), whose sum is σ = 82452480. Its totient is φ = 27442800.

The previous prime is 47904013. The next prime is 47904023. The reversal of 47904021 is 12040974.

It is a happy number.

It is not a de Polignac number, because 47904021 - 2³ = 47904013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47904023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1114026 + ... + 1114068.

It is an arithmetic number, because the mean of its divisors is an integer number (1288320).

Almost surely, 2^47904021 is an apocalyptic number.

It is an amenable number.

47904021 is a deficient number, since it is larger than the sum of its proper divisors (34548459).

47904021 is a wasteful number, since it uses less digits than its factorization.

47904021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 47904021 is about 6921.2730765373. The cubic root of 47904021 is about 363.1817271893.

Adding to 47904021 its reverse (12040974), we get a palindrome (59944995).

The spelling of 47904021 in words is "forty-seven million, nine hundred four thousand, twenty-one".