11861997 has 32 divisors (see below), whose sum is σ = 19353600. Its totient is φ = 6314880.

The previous prime is 11861987. The next prime is 11862007. The reversal of 11861997 is 79916811.

It is an interprime number because it is at equal distance from previous prime (11861987) and next prime (11862007).

It is not a de Polignac number, because 11861997 - 2¹⁰ = 11860973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11861917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19504 + ... + 20102.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^11861997 is an apocalyptic number.

It is an amenable number.

11861997 is a deficient number, since it is larger than the sum of its proper divisors (7491603).

11861997 is a wasteful number, since it uses less digits than its factorization.

11861997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673.

The product of its digits is 27216, while the sum is 42.

The square root of 11861997 is about 3444.1249977316. The cubic root of 11861997 is about 228.0618291842.

The spelling of 11861997 in words is "eleven million, eight hundred sixty-one thousand, nine hundred ninety-seven".