6401819 has 4 divisors (see below), whose sum is σ = 6413640. Its totient is φ = 6390000.

The previous prime is 6401771. The next prime is 6401827. The reversal of 6401819 is 9181046.

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 6401819 - 2¹⁶ = 6336283 is a prime.

It is a super-2 number, since 2×6401819² = 81966573017522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6401791 and 6401800.

It is not an unprimeable number, because it can be changed into a prime (6401849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5057 + ... + 6194.

It is an arithmetic number, because the mean of its divisors is an integer number (1603410).

Almost surely, 2^6401819 is an apocalyptic number.

6401819 is a deficient number, since it is larger than the sum of its proper divisors (11821).

6401819 is a wasteful number, since it uses less digits than its factorization.

6401819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11820.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 6401819 is about 2530.1816140349. The cubic root of 6401819 is about 185.6811413660.

The spelling of 6401819 in words is "six million, four hundred one thousand, eight hundred nineteen".