13465978 has 4 divisors (see below), whose sum is σ = 20198970. Its totient is φ = 6732988.

The previous prime is 13465973. The next prime is 13465979. The reversal of 13465978 is 87956431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13198689 + 267289 = 3633^2 + 517^2 .

It is not an unprimeable number, because it can be changed into a prime (13465973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3366493 + ... + 3366496.

Almost surely, 2^13465978 is an apocalyptic number.

13465978 is a deficient number, since it is larger than the sum of its proper divisors (6732992).

13465978 is an equidigital number, since it uses as much as digits as its factorization.

13465978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6732991.

The product of its digits is 181440, while the sum is 43.

The square root of 13465978 is about 3669.6018857636. The cubic root of 13465978 is about 237.9099652382.

The spelling of 13465978 in words is "thirteen million, four hundred sixty-five thousand, nine hundred seventy-eight".