13940439497 has 4 divisors (see below), whose sum is σ = 13940714436. Its totient is φ = 13940164560.

The previous prime is 13940439493. The next prime is 13940439503. The reversal of 13940439497 is 79493404931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5254945081 + 8685494416 = 72491^2 + 93196^2 .

It is a cyclic number.

It is not a de Polignac number, because 13940439497 - 2² = 13940439493 is a prime.

It is a super-2 number, since 2×13940439497² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13940439493) 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, 36878 + ... + 170999.

It is an arithmetic number, because the mean of its divisors is an integer number (3485178609).

Almost surely, 2^13940439497 is an apocalyptic number.

It is an amenable number.

13940439497 is a deficient number, since it is larger than the sum of its proper divisors (274939).

13940439497 is an equidigital number, since it uses as much as digits as its factorization.

13940439497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274938.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The spelling of 13940439497 in words is "thirteen billion, nine hundred forty million, four hundred thirty-nine thousand, four hundred ninety-seven".