12278890 has 32 divisors (see below), whose sum is σ = 24630480. Its totient is φ = 4376064.

The previous prime is 12278887. The next prime is 12278909. The reversal of 12278890 is 9887221.

It can be written as a sum of positive squares in 8 ways, for example, as 5461569 + 6817321 = 2337^2 + 2611^2 .

It is a super-2 number, since 2×12278890² = 301542279264200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2142 + ... + 5398.

Almost surely, 2^12278890 is an apocalyptic number.

12278890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12278890 is an abundant number, since it is smaller than the sum of its proper divisors (12351590).

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

12278890 is a wasteful number, since it uses less digits than its factorization.

12278890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 12278890 is about 3504.1247123925. The cubic root of 12278890 is about 230.7028907029.

The spelling of 12278890 in words is "twelve million, two hundred seventy-eight thousand, eight hundred ninety".