13140437 has 4 divisors (see below), whose sum is σ = 13355916. Its totient is φ = 12924960.

The previous prime is 13140433. The next prime is 13140461. The reversal of 13140437 is 73404131.

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 7447441 + 5692996 = 2729^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 13140437 - 2² = 13140433 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13140433) 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, 107648 + ... + 107769.

It is an arithmetic number, because the mean of its divisors is an integer number (3338979).

Almost surely, 2^13140437 is an apocalyptic number.

It is an amenable number.

13140437 is a deficient number, since it is larger than the sum of its proper divisors (215479).

13140437 is an equidigital number, since it uses as much as digits as its factorization.

13140437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215478.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 13140437 is about 3624.9740688728. The cubic root of 13140437 is about 235.9771415666.

Adding to 13140437 its reverse (73404131), we get a palindrome (86544568).

The spelling of 13140437 in words is "thirteen million, one hundred forty thousand, four hundred thirty-seven".