1999967 has 4 divisors (see below), whose sum is σ = 2011320. Its totient is φ = 1988616.

The previous prime is 1999957. The next prime is 1999969. The reversal of 1999967 is 7699991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7699991 = 13 ⋅592307.

It is a cyclic number.

It is not a de Polignac number, because 1999967 - 2¹⁰ = 1998943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999969) 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, 5408 + ... + 5765.

It is an arithmetic number, because the mean of its divisors is an integer number (502830).

2^1999967 is an apocalyptic number.

1999967 is a deficient number, since it is larger than the sum of its proper divisors (11353).

1999967 is a wasteful number, since it uses less digits than its factorization.

1999967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11352.

The product of its digits is 275562, while the sum is 50.

The square root of 1999967 is about 1414.2018950631. The cubic root of 1999967 is about 125.9914120291.

The spelling of 1999967 in words is "one million, nine hundred ninety-nine thousand, nine hundred sixty-seven".