401819 has 4 divisors (see below), whose sum is σ = 438360. Its totient is φ = 365280.

The previous prime is 401813. The next prime is 401827. The reversal of 401819 is 918104.

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 401819 - 2¹² = 397723 is a prime.

It is a super-2 number, since 2×401819² = 322917017522, 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 = 401794 and 401803.

It is not an unprimeable number, because it can be changed into a prime (401813) 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, 18254 + ... + 18275.

It is an arithmetic number, because the mean of its divisors is an integer number (109590).

2⁴⁰¹⁸¹⁹ is an apocalyptic number.

401819 is a deficient number, since it is larger than the sum of its proper divisors (36541).

401819 is a wasteful number, since it uses less digits than its factorization.

401819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36540.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 401819 is about 633.8919466281. The cubic root of 401819 is about 73.7921486544.

The spelling of 401819 in words is "four hundred one thousand, eight hundred nineteen".