401686841 has 8 divisors (see below), whose sum is σ = 410758344. Its totient is φ = 392670720.

The previous prime is 401686811. The next prime is 401686843. The reversal of 401686841 is 148686104.

It can be written as a sum of positive squares in 4 ways, for example, as 55875625 + 345811216 = 7475^2 + 18596^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 401686841 - 2¹⁴ = 401670457 is a prime.

It is a super-2 number, since 2×401686841² = 322704636465118562, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401686795 and 401686804.

It is not an unprimeable number, because it can be changed into a prime (401686843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001 + ... + 28361.

It is an arithmetic number, because the mean of its divisors is an integer number (51344793).

Almost surely, 2^401686841 is an apocalyptic number.

It is an amenable number.

401686841 is a deficient number, since it is larger than the sum of its proper divisors (9071503).

401686841 is a wasteful number, since it uses less digits than its factorization.

401686841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27691.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 401686841 is about 20042.1266586158. The cubic root of 401686841 is about 737.8405764336.

The spelling of 401686841 in words is "four hundred one million, six hundred eighty-six thousand, eight hundred forty-one".