2186472397 has 4 divisors (see below), whose sum is σ = 2186662716. Its totient is φ = 2186282080.

The previous prime is 2186472389. The next prime is 2186472451. The reversal of 2186472397 is 7932746812.

It is a happy number.

2186472397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1594085476 + 592386921 = 39926^2 + 24339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2186472397 - 2³ = 2186472389 is a prime.

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 2186472397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2186473397) 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, 76738 + ... + 101299.

It is an arithmetic number, because the mean of its divisors is an integer number (546665679).

Almost surely, 2^2186472397 is an apocalyptic number.

It is an amenable number.

2186472397 is a deficient number, since it is larger than the sum of its proper divisors (190319).

2186472397 is a wasteful number, since it uses less digits than its factorization.

2186472397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190318.

The product of its digits is 1016064, while the sum is 49.

The square root of 2186472397 is about 46759.7305060669. The cubic root of 2186472397 is about 1297.9202241959.

The spelling of 2186472397 in words is "two billion, one hundred eighty-six million, four hundred seventy-two thousand, three hundred ninety-seven".