13840378 has 4 divisors (see below), whose sum is σ = 20760570. Its totient is φ = 6920188.

The previous prime is 13840373. The next prime is 13840381. The reversal of 13840378 is 87304831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87304831 = 107 ⋅815933.

It can be written as a sum of positive squares in only one way, i.e., 10517049 + 3323329 = 3243^2 + 1823^2 .

It is not an unprimeable number, because it can be changed into a prime (13840373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460093 + ... + 3460096.

Almost surely, 2^13840378 is an apocalyptic number.

13840378 is a deficient number, since it is larger than the sum of its proper divisors (6920192).

13840378 is an equidigital number, since it uses as much as digits as its factorization.

13840378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6920191.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 13840378 is about 3720.2658507155. The cubic root of 13840378 is about 240.0947426869.

The spelling of 13840378 in words is "thirteen million, eight hundred forty thousand, three hundred seventy-eight".