1999545 has 8 divisors (see below), whose sum is σ = 3199296. Its totient is φ = 1066416.

The previous prime is 1999537. The next prime is 1999549. The reversal of 1999545 is 5459991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1999545 - 2³ = 1999537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1999497 and 1999506.

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 7 ways as a sum of consecutive naturals, for example, 66637 + ... + 66666.

It is an arithmetic number, because the mean of its divisors is an integer number (399912).

2^1999545 is an apocalyptic number.

1999545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1999545 is a deficient number, since it is larger than the sum of its proper divisors (1199751).

1999545 is a wasteful number, since it uses less digits than its factorization.

1999545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133311.

The product of its digits is 72900, while the sum is 42.

The square root of 1999545 is about 1414.0526864300. The cubic root of 1999545 is about 125.9825498636.

The spelling of 1999545 in words is "one million, nine hundred ninety-nine thousand, five hundred forty-five".