12780342 has 24 divisors (see below), whose sum is σ = 28717416. Its totient is φ = 4259952.

The previous prime is 12780323. The next prime is 12780347. The reversal of 12780342 is 24308721.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12663 + ... + 13634.

It is an arithmetic number, because the mean of its divisors is an integer number (1196559).

Almost surely, 2^12780342 is an apocalyptic number.

12780342 is an abundant number, since it is smaller than the sum of its proper divisors (15937074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12780342 is an equidigital number, since it uses as much as digits as its factorization.

12780342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26314 (or 26302 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 12780342 is about 3574.9604193613. The cubic root of 12780342 is about 233.8016069913.

It can be divided in two parts, 127803 and 42, that multiplied together give a triangular number (5367726 = T₃₂₇₆).

The spelling of 12780342 in words is "twelve million, seven hundred eighty thousand, three hundred forty-two".