11447978 has 8 divisors (see below), whose sum is σ = 17537472. Its totient is φ = 5602156.

The previous prime is 11447977. The next prime is 11447993. The reversal of 11447978 is 87974411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (11447971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60800 + ... + 60987.

It is an arithmetic number, because the mean of its divisors is an integer number (2192184).

Almost surely, 2^11447978 is an apocalyptic number.

11447978 is a deficient number, since it is larger than the sum of its proper divisors (6089494).

11447978 is a wasteful number, since it uses less digits than its factorization.

11447978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121836.

The product of its digits is 56448, while the sum is 41.

The square root of 11447978 is about 3383.4860720860. The cubic root of 11447978 is about 225.3770008816.

The spelling of 11447978 in words is "eleven million, four hundred forty-seven thousand, nine hundred seventy-eight".