13530978 has 24 divisors (see below), whose sum is σ = 29396016. Its totient is φ = 4498200.

The previous prime is 13530941. The next prime is 13530989. The reversal of 13530978 is 87903531.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8073 + ... + 9603.

It is an arithmetic number, because the mean of its divisors is an integer number (1224834).

Almost surely, 2^13530978 is an apocalyptic number.

13530978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13530978 is an abundant number, since it is smaller than the sum of its proper divisors (15865038).

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

13530978 is a wasteful number, since it uses less digits than its factorization.

13530978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030 (or 2027 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 13530978 is about 3678.4477704597. The cubic root of 13530978 is about 238.2921464790.

It can be divided in two parts, 135 and 30978, that added together give a palindrome (31113).

The spelling of 13530978 in words is "thirteen million, five hundred thirty thousand, nine hundred seventy-eight".