401779 has 4 divisors (see below), whose sum is σ = 459184. Its totient is φ = 344376.

The previous prime is 401773. The next prime is 401809. The reversal of 401779 is 977104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401779 - 2³ = 401771 is a prime.

It is a super-2 number, since 2×401779² = 322852729682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401771) 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, 28692 + ... + 28705.

It is an arithmetic number, because the mean of its divisors is an integer number (114796).

2⁴⁰¹⁷⁷⁹ is an apocalyptic number.

401779 is a deficient number, since it is larger than the sum of its proper divisors (57405).

401779 is an equidigital number, since it uses as much as digits as its factorization.

401779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57404.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 401779 is about 633.8603947243. The cubic root of 401779 is about 73.7896999699.

It can be divided in two parts, 40177 and 9, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 401779 in words is "four hundred one thousand, seven hundred seventy-nine".