47179821 has 8 divisors (see below), whose sum is σ = 67745440. Its totient is φ = 29033712.

The previous prime is 47179817. The next prime is 47179823. The reversal of 47179821 is 12897174.

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

It is not a de Polignac number, because 47179821 - 2² = 47179817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1209739 = 47179821 / (4 + 7 + 1 + 7 + 9 + 8 + 2 + 1).

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 47179821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47179823) 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, 604831 + ... + 604908.

It is an arithmetic number, because the mean of its divisors is an integer number (8468180).

Almost surely, 2^47179821 is an apocalyptic number.

It is an amenable number.

47179821 is a deficient number, since it is larger than the sum of its proper divisors (20565619).

47179821 is a wasteful number, since it uses less digits than its factorization.

47179821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209755.

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

The square root of 47179821 is about 6868.7568744279. The cubic root of 47179821 is about 361.3422653582.

The spelling of 47179821 in words is "forty-seven million, one hundred seventy-nine thousand, eight hundred twenty-one".