1291893 has 8 divisors (see below), whose sum is σ = 1729056. Its totient is φ = 858000.

The previous prime is 1291883. The next prime is 1291907. The reversal of 1291893 is 3981921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1291893 - 2⁴ = 1291877 is a prime.

1291893 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343 + ... + 1643.

It is an arithmetic number, because the mean of its divisors is an integer number (216132).

2^1291893 is an apocalyptic number.

It is an amenable number.

1291893 is a deficient number, since it is larger than the sum of its proper divisors (437163).

1291893 is a wasteful number, since it uses less digits than its factorization.

1291893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635.

The product of its digits is 3888, while the sum is 33.

The square root of 1291893 is about 1136.6147104450. The cubic root of 1291893 is about 108.9119452696.

The spelling of 1291893 in words is "one million, two hundred ninety-one thousand, eight hundred ninety-three".