11897855 has 4 divisors (see below), whose sum is σ = 14277432. Its totient is φ = 9518280.

The previous prime is 11897849. The next prime is 11897861. The reversal of 11897855 is 55879811.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (11897849) and next prime (11897861).

It is not a de Polignac number, because 11897855 - 2⁶ = 11897791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1189781 + ... + 1189790.

It is an arithmetic number, because the mean of its divisors is an integer number (3569358).

Almost surely, 2^11897855 is an apocalyptic number.

11897855 is a deficient number, since it is larger than the sum of its proper divisors (2379577).

11897855 is an equidigital number, since it uses as much as digits as its factorization.

11897855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379576.

The product of its digits is 100800, while the sum is 44.

The square root of 11897855 is about 3449.3267459027. The cubic root of 11897855 is about 228.2914030784.

The spelling of 11897855 in words is "eleven million, eight hundred ninety-seven thousand, eight hundred fifty-five".