12291290 has 32 divisors (see below), whose sum is σ = 25410240. Its totient is φ = 4233600.

The previous prime is 12291287. The next prime is 12291313. The reversal of 12291290 is 9219221.

It is a happy number.

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, 851 + ... + 5030.

It is an arithmetic number, because the mean of its divisors is an integer number (794070).

Almost surely, 2^12291290 is an apocalyptic number.

12291290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12291290 is an abundant number, since it is smaller than the sum of its proper divisors (13118950).

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

12291290 is a wasteful number, since it uses less digits than its factorization.

12291290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5918.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 12291290 is about 3505.8936093384. The cubic root of 12291290 is about 230.7805240342.

The spelling of 12291290 in words is "twelve million, two hundred ninety-one thousand, two hundred ninety".