11909878 has 4 divisors (see below), whose sum is σ = 17864820. Its totient is φ = 5954938.

The previous prime is 11909873. The next prime is 11909879. The reversal of 11909878 is 87890911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87890911 = 2957 ⋅29723.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2977468 + ... + 2977471.

It is an arithmetic number, because the mean of its divisors is an integer number (4466205).

Almost surely, 2^11909878 is an apocalyptic number.

11909878 is a deficient number, since it is larger than the sum of its proper divisors (5954942).

11909878 is an equidigital number, since it uses as much as digits as its factorization.

11909878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5954941.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 11909878 is about 3451.0691097108. The cubic root of 11909878 is about 228.3682747363.

The spelling of 11909878 in words is "eleven million, nine hundred nine thousand, eight hundred seventy-eight".