12291420 has 24 divisors (see below), whose sum is σ = 34416144. Its totient is φ = 3277696.

The previous prime is 12291413. The next prime is 12291427. The reversal of 12291420 is 2419221.

It is an interprime number because it is at equal distance from previous prime (12291413) and next prime (12291427).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12291427) 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, 102369 + ... + 102488.

It is an arithmetic number, because the mean of its divisors is an integer number (1434006).

Almost surely, 2^12291420 is an apocalyptic number.

12291420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12291420 is an abundant number, since it is smaller than the sum of its proper divisors (22124724).

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

12291420 is a wasteful number, since it uses less digits than its factorization.

12291420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204869 (or 204867 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12291420 is about 3505.9121494983. The cubic root of 12291420 is about 230.7813376554.

The spelling of 12291420 in words is "twelve million, two hundred ninety-one thousand, four hundred twenty".