13780043 has 4 divisors (see below), whose sum is σ = 13879320. Its totient is φ = 13680768.

The previous prime is 13780037. The next prime is 13780069. The reversal of 13780043 is 34008731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34008731 = 67 ⋅507593.

It is a cyclic number.

It is not a de Polignac number, because 13780043 - 2¹² = 13775947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13779994 and 13780021.

It is not an unprimeable number, because it can be changed into a prime (13780003) 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, 49430 + ... + 49707.

It is an arithmetic number, because the mean of its divisors is an integer number (3469830).

Almost surely, 2^13780043 is an apocalyptic number.

13780043 is a deficient number, since it is larger than the sum of its proper divisors (99277).

13780043 is an equidigital number, since it uses as much as digits as its factorization.

13780043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99276.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 13780043 is about 3712.1480304535. The cubic root of 13780043 is about 239.7453491124.

Adding to 13780043 its reverse (34008731), we get a palindrome (47788774).

The spelling of 13780043 in words is "thirteen million, seven hundred eighty thousand, forty-three".