401899 has 4 divisors (see below), whose sum is σ = 409536. Its totient is φ = 394264.

The previous prime is 401887. The next prime is 401903. The reversal of 401899 is 998104.

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 401899 - 2⁵ = 401867 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

401899 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 401899.

It is not an unprimeable number, because it can be changed into a prime (401809) 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, 3739 + ... + 3844.

It is an arithmetic number, because the mean of its divisors is an integer number (102384).

2⁴⁰¹⁸⁹⁹ is an apocalyptic number.

401899 is a deficient number, since it is larger than the sum of its proper divisors (7637).

401899 is an equidigital number, since it uses as much as digits as its factorization.

401899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7636.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 401899 is about 633.9550457249. The cubic root of 401899 is about 73.7970455360.

The spelling of 401899 in words is "four hundred one thousand, eight hundred ninety-nine".