13745978 has 8 divisors (see below), whose sum is σ = 20750772. Its totient is φ = 6829056.

The previous prime is 13745959. The next prime is 13745993. The reversal of 13745978 is 87954731.

It can be written as a sum of positive squares in 2 ways, for example, as 11444689 + 2301289 = 3383^2 + 1517^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13745978² = 377903822352968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21575 + ... + 22202.

Almost surely, 2^13745978 is an apocalyptic number.

13745978 is a deficient number, since it is larger than the sum of its proper divisors (7004794).

13745978 is a wasteful number, since it uses less digits than its factorization.

13745978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43936.

The product of its digits is 211680, while the sum is 44.

The square root of 13745978 is about 3707.5568775138. The cubic root of 13745978 is about 239.5476316774.

The spelling of 13745978 in words is "thirteen million, seven hundred forty-five thousand, nine hundred seventy-eight".