11972778 has 16 divisors (see below), whose sum is σ = 24166560. Its totient is φ = 3954096.

The previous prime is 11972767. The next prime is 11972783. The reversal of 11972778 is 87727911.

11972778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8500 + ... + 9807.

It is an arithmetic number, because the mean of its divisors is an integer number (1510410).

Almost surely, 2^11972778 is an apocalyptic number.

11972778 is an abundant number, since it is smaller than the sum of its proper divisors (12193782).

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

11972778 is a wasteful number, since it uses less digits than its factorization.

11972778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18421.

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

The square root of 11972778 is about 3460.1702270264. The cubic root of 11972778 is about 228.7695984880.

It can be divided in two parts, 119727 and 78, that added together give a triangular number (119805 = T₄₈₉).

The spelling of 11972778 in words is "eleven million, nine hundred seventy-two thousand, seven hundred seventy-eight".