1999401 has 4 divisors (see below), whose sum is σ = 2665872. Its totient is φ = 1332932.

The previous prime is 1999379. The next prime is 1999423. The reversal of 1999401 is 1049991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1999379) and next prime (1999423).

It is a cyclic number.

It is not a de Polignac number, because 1999401 - 2⁷ = 1999273 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1999441) 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, 333231 + ... + 333236.

It is an arithmetic number, because the mean of its divisors is an integer number (666468).

2^1999401 is an apocalyptic number.

It is an amenable number.

1999401 is a deficient number, since it is larger than the sum of its proper divisors (666471).

1999401 is an equidigital number, since it uses as much as digits as its factorization.

1999401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666470.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 1999401 is about 1414.0017680328. The cubic root of 1999401 is about 125.9795255217.

The spelling of 1999401 in words is "one million, nine hundred ninety-nine thousand, four hundred one".