11649978 has 24 divisors (see below), whose sum is σ = 25341888. Its totient is φ = 3867912.

The previous prime is 11649977. The next prime is 11650003. The reversal of 11649978 is 87994611.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11649971) 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 11 ways as a sum of consecutive naturals, for example, 3951 + ... + 6237.

It is an arithmetic number, because the mean of its divisors is an integer number (1055912).

Almost surely, 2^11649978 is an apocalyptic number.

11649978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11649978 is an abundant number, since it is smaller than the sum of its proper divisors (13691910).

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

11649978 is a wasteful number, since it uses less digits than its factorization.

11649978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578 (or 2575 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 11649978 is about 3413.2064104006. The cubic root of 11649978 is about 226.6948749015.

The spelling of 11649978 in words is "eleven million, six hundred forty-nine thousand, nine hundred seventy-eight".