47823409 has 2 divisors, whose sum is σ = 47823410. Its totient is φ = 47823408.

The previous prime is 47823401. The next prime is 47823427. The reversal of 47823409 is 90432874.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39250225 + 8573184 = 6265^2 + 2928^2 .

It is a cyclic number.

It is not a de Polignac number, because 47823409 - 2³ = 47823401 is a prime.

It is a Chen prime.

It is equal to p_2878183 and since 47823409 and 2878183 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (47823401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23911704 + 23911705.

It is an arithmetic number, because the mean of its divisors is an integer number (23911705).

Almost surely, 2^47823409 is an apocalyptic number.

It is an amenable number.

47823409 is a deficient number, since it is larger than the sum of its proper divisors (1).

47823409 is an equidigital number, since it uses as much as digits as its factorization.

47823409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 47823409 is about 6915.4471294342. The cubic root of 47823409 is about 362.9778943147.

The spelling of 47823409 in words is "forty-seven million, eight hundred twenty-three thousand, four hundred nine".