12549978 has 144 divisors (see below), whose sum is σ = 35852544. Its totient is φ = 3265920.

The previous prime is 12549913. The next prime is 12550001. The reversal of 12549978 is 87994521.

12549978 is a `hidden beast` number, since 12 + 549 + 97 + 8 = 666.

Its product of digits (181440) is a multiple of the sum of its prime divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 404823 + ... + 404853.

It is an arithmetic number, because the mean of its divisors is an integer number (248976).

Almost surely, 2^12549978 is an apocalyptic number.

12549978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12549978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17926272).

12549978 is an abundant number, since it is smaller than the sum of its proper divisors (23302566).

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

12549978 is a wasteful number, since it uses less digits than its factorization.

12549978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 60 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 12549978 is about 3542.5948117164. The cubic root of 12549978 is about 232.3883334735.

The spelling of 12549978 in words is "twelve million, five hundred forty-nine thousand, nine hundred seventy-eight".