1319999 has 4 divisors (see below), whose sum is σ = 1397664. Its totient is φ = 1242336.

The previous prime is 1319963. The next prime is 1320019. The reversal of 1319999 is 9999131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9999131 = 317 ⋅31543.

It is a cyclic number.

It is not a de Polignac number, because 1319999 - 2⁸ = 1319743 is a prime.

It is a Duffinian number.

1319999 is a modest number, since divided by 9999 gives 131 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1319909) 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, 38807 + ... + 38840.

It is an arithmetic number, because the mean of its divisors is an integer number (349416).

2^1319999 is an apocalyptic number.

1319999 is a deficient number, since it is larger than the sum of its proper divisors (77665).

1319999 is an equidigital number, since it uses as much as digits as its factorization.

1319999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77664.

The product of its digits is 19683, while the sum is 41.

The square root of 1319999 is about 1148.9120941134. The cubic root of 1319999 is about 109.6961033476.

The spelling of 1319999 in words is "one million, three hundred nineteen thousand, nine hundred ninety-nine".