13940819 has 4 divisors (see below), whose sum is σ = 13957944. Its totient is φ = 13923696.

The previous prime is 13940809. The next prime is 13940827. The reversal of 13940819 is 91804931.

13940819 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: 91804931 = 131 ⋅700801.

It is a cyclic number.

It is not a de Polignac number, because 13940819 - 2⁴ = 13940803 is a prime.

It is a super-2 number, since 2×13940819² = 388692868781522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13940809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7277 + ... + 8990.

It is an arithmetic number, because the mean of its divisors is an integer number (3489486).

Almost surely, 2^13940819 is an apocalyptic number.

13940819 is a deficient number, since it is larger than the sum of its proper divisors (17125).

13940819 is an equidigital number, since it uses as much as digits as its factorization.

13940819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17124.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 13940819 is about 3733.7406176648. The cubic root of 13940819 is about 240.6741405007.

The spelling of 13940819 in words is "thirteen million, nine hundred forty thousand, eight hundred nineteen".