14139778 has 4 divisors (see below), whose sum is σ = 21209670. Its totient is φ = 7069888.

The previous prime is 14139773. The next prime is 14139821. The reversal of 14139778 is 87793141.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87793141 = 9221 ⋅9521.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 471969 = 3697^2 + 687^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 14139778.

It is not an unprimeable number, because it can be changed into a prime (14139773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3534943 + ... + 3534946.

Almost surely, 2^14139778 is an apocalyptic number.

14139778 is a deficient number, since it is larger than the sum of its proper divisors (7069892).

14139778 is an equidigital number, since it uses as much as digits as its factorization.

14139778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7069891.

The product of its digits is 42336, while the sum is 40.

The square root of 14139778 is about 3760.2896165056. The cubic root of 14139778 is about 241.8136784991.

The spelling of 14139778 in words is "fourteen million, one hundred thirty-nine thousand, seven hundred seventy-eight".