47894309 has 4 divisors (see below), whose sum is σ = 48011820. Its totient is φ = 47776800.

The previous prime is 47894293. The next prime is 47894369. The reversal of 47894309 is 90349874.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23668225 + 24226084 = 4865^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 47894309 - 2⁴ = 47894293 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 47894309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47894369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58142 + ... + 58959.

It is an arithmetic number, because the mean of its divisors is an integer number (12002955).

Almost surely, 2^47894309 is an apocalyptic number.

It is an amenable number.

47894309 is a deficient number, since it is larger than the sum of its proper divisors (117511).

47894309 is a wasteful number, since it uses less digits than its factorization.

47894309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117510.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 47894309 is about 6920.5714359437. The cubic root of 47894309 is about 363.1571818640.

The spelling of 47894309 in words is "forty-seven million, eight hundred ninety-four thousand, three hundred nine".