1991467 has 4 divisors (see below), whose sum is σ = 2024176. Its totient is φ = 1958760.

The previous prime is 1991461. The next prime is 1991477. The reversal of 1991467 is 7641991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1991467 - 2¹¹ = 1989419 is a prime.

It is a super-3 number, since 3×1991467³ = 23694120753685333689, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1991461) 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, 16263 + ... + 16384.

It is an arithmetic number, because the mean of its divisors is an integer number (506044).

2^1991467 is an apocalyptic number.

1991467 is a deficient number, since it is larger than the sum of its proper divisors (32709).

1991467 is an equidigital number, since it uses as much as digits as its factorization.

1991467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32708.

The product of its digits is 13608, while the sum is 37.

The square root of 1991467 is about 1411.1934665382. The cubic root of 1991467 is about 125.8126677854.

The spelling of 1991467 in words is "one million, nine hundred ninety-one thousand, four hundred sixty-seven".