47390309 has 2 divisors, whose sum is σ = 47390310. Its totient is φ = 47390308.

The previous prime is 47390297. The next prime is 47390323. The reversal of 47390309 is 90309374.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36566209 + 10824100 = 6047^2 + 3290^2 .

It is a cyclic number.

It is not a de Polignac number, because 47390309 - 2¹⁶ = 47324773 is a prime.

It is equal to p_2853764 and since 47390309 and 2853764 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47396309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23695154 + 23695155.

It is an arithmetic number, because the mean of its divisors is an integer number (23695155).

Almost surely, 2^47390309 is an apocalyptic number.

It is an amenable number.

47390309 is a deficient number, since it is larger than the sum of its proper divisors (1).

47390309 is an equidigital number, since it uses as much as digits as its factorization.

47390309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 47390309 is about 6884.0619549798. The cubic root of 47390309 is about 361.8788321925.

The spelling of 47390309 in words is "forty-seven million, three hundred ninety thousand, three hundred nine".