909447947 has 4 divisors (see below), whose sum is σ = 909576360. Its totient is φ = 909319536.

The previous prime is 909447941. The next prime is 909447953. The reversal of 909447947 is 749744909.

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

It is an interprime number because it is at equal distance from previous prime (909447941) and next prime (909447953).

It is a cyclic number.

It is not a de Polignac number, because 909447947 - 2¹⁸ = 909185803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909447941) 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, 52922 + ... + 67967.

It is an arithmetic number, because the mean of its divisors is an integer number (227394090).

Almost surely, 2^909447947 is an apocalyptic number.

909447947 is a deficient number, since it is larger than the sum of its proper divisors (128413).

909447947 is a wasteful number, since it uses less digits than its factorization.

909447947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128412.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 909447947 is about 30157.0546804558. The cubic root of 909447947 is about 968.8561096841.

The spelling of 909447947 in words is "nine hundred nine million, four hundred forty-seven thousand, nine hundred forty-seven".