1811397 has 8 divisors (see below), whose sum is σ = 2760256. Its totient is φ = 1035072.

The previous prime is 1811389. The next prime is 1811413. The reversal of 1811397 is 7931181.

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

It is not a de Polignac number, because 1811397 - 2³ = 1811389 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 (1811347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43108 + ... + 43149.

It is an arithmetic number, because the mean of its divisors is an integer number (345032).

2^1811397 is an apocalyptic number.

It is an amenable number.

1811397 is a deficient number, since it is larger than the sum of its proper divisors (948859).

1811397 is an equidigital number, since it uses as much as digits as its factorization.

1811397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86267.

The product of its digits is 1512, while the sum is 30.

The square root of 1811397 is about 1345.8814955263. The cubic root of 1811397 is about 121.9002364571.

The spelling of 1811397 in words is "one million, eight hundred eleven thousand, three hundred ninety-seven".