11487978 has 24 divisors (see below), whose sum is σ = 24960000. Its totient is φ = 3818664.

The previous prime is 11487977. The next prime is 11487979. The reversal of 11487978 is 87978411.

It is an interprime number because it is at equal distance from previous prime (11487977) and next prime (11487979).

It is not an unprimeable number, because it can be changed into a prime (11487977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8343 + ... + 9621.

It is an arithmetic number, because the mean of its divisors is an integer number (1040000).

Almost surely, 2^11487978 is an apocalyptic number.

11487978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11487978 is an abundant number, since it is smaller than the sum of its proper divisors (13472022).

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

11487978 is a wasteful number, since it uses less digits than its factorization.

11487978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786 (or 1783 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 11487978 is about 3389.3919808721. The cubic root of 11487978 is about 225.6391898494.

The spelling of 11487978 in words is "eleven million, four hundred eighty-seven thousand, nine hundred seventy-eight".