12422640 has 80 divisors (see below), whose sum is σ = 38854656. Its totient is φ = 3283200.

The previous prime is 12422633. The next prime is 12422647. The reversal of 12422640 is 4622421.

It is an interprime number because it is at equal distance from previous prime (12422633) and next prime (12422647).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12422647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45705 + ... + 45975.

Almost surely, 2^12422640 is an apocalyptic number.

12422640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12422640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19427328).

12422640 is an abundant number, since it is smaller than the sum of its proper divisors (26432016).

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

12422640 is a wasteful number, since it uses less digits than its factorization.

12422640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 12422640 is about 3524.5765703131. The cubic root of 12422640 is about 231.5996861955.

The spelling of 12422640 in words is "twelve million, four hundred twenty-two thousand, six hundred forty".