12397890 has 16 divisors (see below), whose sum is σ = 29755008. Its totient is φ = 3306096.

The previous prime is 12397883. The next prime is 12397909. The reversal of 12397890 is 9879321.

12397890 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206602 + ... + 206661.

It is an arithmetic number, because the mean of its divisors is an integer number (1859688).

Almost surely, 2^12397890 is an apocalyptic number.

12397890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12397890 is an abundant number, since it is smaller than the sum of its proper divisors (17357118).

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

12397890 is a wasteful number, since it uses less digits than its factorization.

12397890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413273.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 12397890 is about 3521.0637597181. The cubic root of 12397890 is about 231.4457762592.

Subtracting from 12397890 its reverse (9879321), we obtain a square (2518569 = 1587²).

The spelling of 12397890 in words is "twelve million, three hundred ninety-seven thousand, eight hundred ninety".