1999479 has 4 divisors (see below), whose sum is σ = 2665976. Its totient is φ = 1332984.

The previous prime is 1999471. The next prime is 1999499. The reversal of 1999479 is 9749991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9749991 = 3 ⋅3249997.

It is not a de Polignac number, because 1999479 - 2³ = 1999471 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999471) 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, 333244 + ... + 333249.

It is an arithmetic number, because the mean of its divisors is an integer number (666494).

2^1999479 is an apocalyptic number.

1999479 is a deficient number, since it is larger than the sum of its proper divisors (666497).

1999479 is an equidigital number, since it uses as much as digits as its factorization.

1999479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666496.

The product of its digits is 183708, while the sum is 48.

The square root of 1999479 is about 1414.0293490589. The cubic root of 1999479 is about 125.9811637249.

The spelling of 1999479 in words is "one million, nine hundred ninety-nine thousand, four hundred seventy-nine".