1999541 has 4 divisors (see below), whose sum is σ = 2104800. Its totient is φ = 1894284.

The previous prime is 1999537. The next prime is 1999549. The reversal of 1999541 is 1459991.

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 a cyclic number.

It is not a de Polignac number, because 1999541 - 2² = 1999537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1999495 and 1999504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52601 + ... + 52638.

It is an arithmetic number, because the mean of its divisors is an integer number (526200).

2^1999541 is an apocalyptic number.

It is an amenable number.

1999541 is a deficient number, since it is larger than the sum of its proper divisors (105259).

1999541 is a wasteful number, since it uses less digits than its factorization.

1999541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105258.

The product of its digits is 14580, while the sum is 38.

The square root of 1999541 is about 1414.0512720549. The cubic root of 1999541 is about 125.9824658560.

The spelling of 1999541 in words is "one million, nine hundred ninety-nine thousand, five hundred forty-one".