11772978 has 32 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 3306000.

The previous prime is 11772973. The next prime is 11772979. The reversal of 11772978 is 87927711.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (11772973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103 + ... + 4853.

It is an arithmetic number, because the mean of its divisors is an integer number (855360).

Almost surely, 2^11772978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11772978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13685760).

11772978 is an abundant number, since it is smaller than the sum of its proper divisors (15598542).

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

11772978 is a wasteful number, since it uses less digits than its factorization.

11772978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4822.

The product of its digits is 49392, while the sum is 42.

The square root of 11772978 is about 3431.1773489576. The cubic root of 11772978 is about 227.4898952965.

The spelling of 11772978 in words is "eleven million, seven hundred seventy-two thousand, nine hundred seventy-eight".