47379821 has 2 divisors, whose sum is σ = 47379822. Its totient is φ = 47379820.

The previous prime is 47379809. The next prime is 47379853. The reversal of 47379821 is 12897374.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46717225 + 662596 = 6835^2 + 814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47379821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47369821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23689910 + 23689911.

It is an arithmetic number, because the mean of its divisors is an integer number (23689911).

Almost surely, 2^47379821 is an apocalyptic number.

It is an amenable number.

47379821 is a deficient number, since it is larger than the sum of its proper divisors (1).

47379821 is an equidigital number, since it uses as much as digits as its factorization.

47379821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 47379821 is about 6883.3001532695. The cubic root of 47379821 is about 361.8521342924.

The spelling of 47379821 in words is "forty-seven million, three hundred seventy-nine thousand, eight hundred twenty-one".