47207809 has 4 divisors (see below), whose sum is σ = 51499440. Its totient is φ = 42916180.

The previous prime is 47207807. The next prime is 47207813. The reversal of 47207809 is 90870274.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47207809 - 2¹ = 47207807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47207801) 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, 2145799 + ... + 2145820.

It is an arithmetic number, because the mean of its divisors is an integer number (12874860).

Almost surely, 2^47207809 is an apocalyptic number.

It is an amenable number.

47207809 is a deficient number, since it is larger than the sum of its proper divisors (4291631).

47207809 is a wasteful number, since it uses less digits than its factorization.

47207809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291630.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 47207809 is about 6870.7939133698. The cubic root of 47207809 is about 361.4137030193.

The spelling of 47207809 in words is "forty-seven million, two hundred seven thousand, eight hundred nine".