12780389 has 4 divisors (see below), whose sum is σ = 12808224. Its totient is φ = 12752556.

The previous prime is 12780373. The next prime is 12780409. The reversal of 12780389 is 98308721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98308721 = 7 ⋅14044103.

It is a cyclic number.

It is not a de Polignac number, because 12780389 - 2⁴ = 12780373 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 (12780349) 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, 13217 + ... + 14150.

It is an arithmetic number, because the mean of its divisors is an integer number (3202056).

Almost surely, 2^12780389 is an apocalyptic number.

It is an amenable number.

12780389 is a deficient number, since it is larger than the sum of its proper divisors (27835).

12780389 is an equidigital number, since it uses as much as digits as its factorization.

12780389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27834.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 12780389 is about 3574.9669928546. The cubic root of 12780389 is about 233.8018935945.

The spelling of 12780389 in words is "twelve million, seven hundred eighty thousand, three hundred eighty-nine".