2188453947 has 8 divisors (see below), whose sum is σ = 2938931520. Its totient is φ = 1448472840.

The previous prime is 2188453921. The next prime is 2188453951. The reversal of 2188453947 is 7493548812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2188453947 - 2²⁰ = 2187405371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2188453947.

It is not an unprimeable number, because it can be changed into a prime (2188453147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2623629 + ... + 2624462.

It is an arithmetic number, because the mean of its divisors is an integer number (367366440).

Almost surely, 2^2188453947 is an apocalyptic number.

2188453947 is a deficient number, since it is larger than the sum of its proper divisors (750477573).

2188453947 is a wasteful number, since it uses less digits than its factorization.

2188453947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5248233.

The product of its digits is 1935360, while the sum is 51.

The square root of 2188453947 is about 46780.9143454892. The cubic root of 2188453947 is about 1298.3121976269.

The spelling of 2188453947 in words is "two billion, one hundred eighty-eight million, four hundred fifty-three thousand, nine hundred forty-seven".