11897813 has 4 divisors (see below), whose sum is σ = 11988768. Its totient is φ = 11806860.

The previous prime is 11897803. The next prime is 11897827. The reversal of 11897813 is 31879811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11897813 - 2¹⁰ = 11896789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11897803) 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, 45281 + ... + 45542.

It is an arithmetic number, because the mean of its divisors is an integer number (2997192).

Almost surely, 2^11897813 is an apocalyptic number.

It is an amenable number.

11897813 is a deficient number, since it is larger than the sum of its proper divisors (90955).

11897813 is an equidigital number, since it uses as much as digits as its factorization.

11897813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90954.

The product of its digits is 12096, while the sum is 38.

The square root of 11897813 is about 3449.3206577528. The cubic root of 11897813 is about 228.2911344515.

The spelling of 11897813 in words is "eleven million, eight hundred ninety-seven thousand, eight hundred thirteen".