12781390 has 8 divisors (see below), whose sum is σ = 23006520. Its totient is φ = 5112552.

The previous prime is 12781367. The next prime is 12781411. The reversal of 12781390 is 9318721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639060 + ... + 639079.

It is an arithmetic number, because the mean of its divisors is an integer number (2875815).

Almost surely, 2^12781390 is an apocalyptic number.

12781390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12781390 is a deficient number, since it is larger than the sum of its proper divisors (10225130).

12781390 is a wasteful number, since it uses less digits than its factorization.

12781390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278146.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 12781390 is about 3575.1069914060. The cubic root of 12781390 is about 233.8079974667.

The spelling of 12781390 in words is "twelve million, seven hundred eighty-one thousand, three hundred ninety".