13485978 has 24 divisors (see below), whose sum is σ = 31876416. Its totient is φ = 4086600.

The previous prime is 13485977. The next prime is 13486001. The reversal of 13485978 is 87958431.

13485978 is a `hidden beast` number, since 13 + 48 + 597 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (13485971) 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, 33858 + ... + 34253.

It is an arithmetic number, because the mean of its divisors is an integer number (1328184).

Almost surely, 2^13485978 is an apocalyptic number.

13485978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13485978 is an abundant number, since it is smaller than the sum of its proper divisors (18390438).

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

13485978 is a wasteful number, since it uses less digits than its factorization.

13485978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68130 (or 68127 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 13485978 is about 3672.3259659240. The cubic root of 13485978 is about 238.0276902086.

The spelling of 13485978 in words is "thirteen million, four hundred eighty-five thousand, nine hundred seventy-eight".