4386721946 has 8 divisors (see below), whose sum is σ = 6806982420. Its totient is φ = 2117727808.

The previous prime is 4386721909. The next prime is 4386721981. The reversal of 4386721946 is 6491276834.

It can be written as a sum of positive squares in 2 ways, for example, as 4367755921 + 18966025 = 66089^2 + 4355^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 4386721894 and 4386721903.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37816511 + ... + 37816626.

Almost surely, 2^4386721946 is an apocalyptic number.

4386721946 is a deficient number, since it is larger than the sum of its proper divisors (2420260474).

4386721946 is a wasteful number, since it uses less digits than its factorization.

4386721946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75633168.

The product of its digits is 1741824, while the sum is 50.

The square root of 4386721946 is about 66232.3330858879. Note that the first 3 decimals coincide. The cubic root of 4386721946 is about 1636.9925482044.

The spelling of 4386721946 in words is "four billion, three hundred eighty-six million, seven hundred twenty-one thousand, nine hundred forty-six".