401986 has 8 divisors (see below), whose sum is σ = 649404. Its totient is φ = 185520.

The previous prime is 401981. The next prime is 401987. The reversal of 401986 is 689104.

401986 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 354025 + 47961 = 595^2 + 219^2 .

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 (401981) 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, 7705 + ... + 7756.

2⁴⁰¹⁹⁸⁶ is an apocalyptic number.

401986 is a deficient number, since it is larger than the sum of its proper divisors (247418).

401986 is a wasteful number, since it uses less digits than its factorization.

401986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15476.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 401986 is about 634.0236588646. The cubic root of 401986 is about 73.8023701572.

It can be divided in two parts, 40198 and 6, that added together give a palindrome (40204).

The spelling of 401986 in words is "four hundred one thousand, nine hundred eighty-six".