47219909 has 4 divisors (see below), whose sum is σ = 51512640. Its totient is φ = 42927180.

The previous prime is 47219903. The next prime is 47219911. The reversal of 47219909 is 90991274.

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 47219909 - 2¹² = 47215813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47219903) 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, 2146349 + ... + 2146370.

It is an arithmetic number, because the mean of its divisors is an integer number (12878160).

Almost surely, 2^47219909 is an apocalyptic number.

It is an amenable number.

47219909 is a deficient number, since it is larger than the sum of its proper divisors (4292731).

47219909 is a wasteful number, since it uses less digits than its factorization.

47219909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292730.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 47219909 is about 6871.6743956622. The cubic root of 47219909 is about 361.4445787884. Note that the first 3 decimals are identical.

The spelling of 47219909 in words is "forty-seven million, two hundred nineteen thousand, nine hundred nine".