4181986 has 8 divisors (see below), whose sum is σ = 6288300. Its totient is φ = 2085888.

The previous prime is 4181981. The next prime is 4181987. The reversal of 4181986 is 6891814.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4076361 + 105625 = 2019^2 + 325^2 .

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

It is not an unprimeable number, because it can be changed into a prime (4181981) 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, 1431 + ... + 3226.

Almost surely, 2^4181986 is an apocalyptic number.

4181986 is a deficient number, since it is larger than the sum of its proper divisors (2106314).

4181986 is a wasteful number, since it uses less digits than its factorization.

4181986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108.

The product of its digits is 13824, while the sum is 37.

The square root of 4181986 is about 2044.9904645254. The cubic root of 4181986 is about 161.1118649544. Note that the first 3 decimals are identical.

It can be divided in two parts, 41819 and 86, that added together give a triangular number (41905 = T₂₈₉).

The spelling of 4181986 in words is "four million, one hundred eighty-one thousand, nine hundred eighty-six".