11897778 has 16 divisors (see below), whose sum is σ = 23855040. Its totient is φ = 3956016.

The previous prime is 11897777. The next prime is 11897779. The reversal of 11897778 is 87779811.

It is an interprime number because it is at equal distance from previous prime (11897777) and next prime (11897779).

It is not an unprimeable number, because it can be changed into a prime (11897771) 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, 376 + ... + 4892.

It is an arithmetic number, because the mean of its divisors is an integer number (1490940).

Almost surely, 2^11897778 is an apocalyptic number.

11897778 is an abundant number, since it is smaller than the sum of its proper divisors (11957262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11897778 is a wasteful number, since it uses less digits than its factorization.

11897778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961.

The product of its digits is 197568, while the sum is 48.

The square root of 11897778 is about 3449.3155842863. The cubic root of 11897778 is about 228.2909105953.

The spelling of 11897778 in words is "eleven million, eight hundred ninety-seven thousand, seven hundred seventy-eight".