47742209 has 2 divisors, whose sum is σ = 47742210. Its totient is φ = 47742208.

The previous prime is 47742187. The next prime is 47742259. The reversal of 47742209 is 90224774.

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., 29866225 + 17875984 = 5465^2 + 4228^2 .

It is a cyclic number.

It is not a de Polignac number, because 47742209 - 2¹² = 47738113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (47742259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23871104 + 23871105.

It is an arithmetic number, because the mean of its divisors is an integer number (23871105).

Almost surely, 2^47742209 is an apocalyptic number.

It is an amenable number.

47742209 is a deficient number, since it is larger than the sum of its proper divisors (1).

47742209 is an equidigital number, since it uses as much as digits as its factorization.

47742209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 47742209 is about 6909.5737205706. The cubic root of 47742209 is about 362.7723429421.

The spelling of 47742209 in words is "forty-seven million, seven hundred forty-two thousand, two hundred nine".