1967993 has 4 divisors (see below), whose sum is σ = 2021220. Its totient is φ = 1914768.

The previous prime is 1967947. The next prime is 1968017. The reversal of 1967993 is 3997691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3997691 = 157 ⋅25463.

It can be written as a sum of positive squares in 2 ways, for example, as 1857769 + 110224 = 1363^2 + 332^2 .

It is a cyclic number.

It is not a de Polignac number, because 1967993 - 2¹⁶ = 1902457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1967923) 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, 26558 + ... + 26631.

It is an arithmetic number, because the mean of its divisors is an integer number (505305).

2^1967993 is an apocalyptic number.

It is an amenable number.

1967993 is a deficient number, since it is larger than the sum of its proper divisors (53227).

1967993 is an equidigital number, since it uses as much as digits as its factorization.

1967993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53226.

The product of its digits is 91854, while the sum is 44.

The square root of 1967993 is about 1402.8517384243. The cubic root of 1967993 is about 125.3163825411.

The spelling of 1967993 in words is "one million, nine hundred sixty-seven thousand, nine hundred ninety-three".