13829978 has 4 divisors (see below), whose sum is σ = 20744970. Its totient is φ = 6914988.

The previous prime is 13829947. The next prime is 13829987. The reversal of 13829978 is 87992831.

13829978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87992831 = 131 ⋅671701.

It can be written as a sum of positive squares in only one way, i.e., 10543009 + 3286969 = 3247^2 + 1813^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3457493 + ... + 3457496.

Almost surely, 2^13829978 is an apocalyptic number.

13829978 is a deficient number, since it is larger than the sum of its proper divisors (6914992).

13829978 is an equidigital number, since it uses as much as digits as its factorization.

13829978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6914991.

The product of its digits is 217728, while the sum is 47.

The square root of 13829978 is about 3718.8678384691. The cubic root of 13829978 is about 240.0345899219.

The spelling of 13829978 in words is "thirteen million, eight hundred twenty-nine thousand, nine hundred seventy-eight".