12778390 has 16 divisors (see below), whose sum is σ = 24354432. Its totient is φ = 4810624.

The previous prime is 12778369. The next prime is 12778391. The reversal of 12778390 is 9387721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37414 + ... + 37753.

It is an arithmetic number, because the mean of its divisors is an integer number (1522152).

Almost surely, 2^12778390 is an apocalyptic number.

12778390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12778390 is a deficient number, since it is larger than the sum of its proper divisors (11576042).

12778390 is a wasteful number, since it uses less digits than its factorization.

12778390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75191.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 12778390 is about 3574.6873989204. The cubic root of 12778390 is about 233.7897031895.

The spelling of 12778390 in words is "twelve million, seven hundred seventy-eight thousand, three hundred ninety".