12420661 has 16 divisors (see below), whose sum is σ = 14492160. Its totient is φ = 10525680.

The previous prime is 12420649. The next prime is 12420673. The reversal of 12420661 is 16602421.

It is an interprime number because it is at equal distance from previous prime (12420649) and next prime (12420673).

It is not a de Polignac number, because 12420661 - 2¹³ = 12412469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13560 + ... + 14446.

It is an arithmetic number, because the mean of its divisors is an integer number (905760).

Almost surely, 2^12420661 is an apocalyptic number.

12420661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12420661 is a deficient number, since it is larger than the sum of its proper divisors (2071499).

12420661 is a wasteful number, since it uses less digits than its factorization.

12420661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 12420661 is about 3524.2958161880. The cubic root of 12420661 is about 231.5873871426.

The spelling of 12420661 in words is "twelve million, four hundred twenty thousand, six hundred sixty-one".