1226640 has 80 divisors (see below), whose sum is σ = 4017600. Its totient is φ = 308736.

The previous prime is 1226629. The next prime is 1226651. The reversal of 1226640 is 466221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1226629) and next prime (1226651).

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

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, 4426 + ... + 4694.

It is an arithmetic number, because the mean of its divisors is an integer number (50220).

2^1226640 is an apocalyptic number.

1226640 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 1226640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2008800).

1226640 is an abundant number, since it is smaller than the sum of its proper divisors (2790960).

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

1226640 is a wasteful number, since it uses less digits than its factorization.

1226640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1226640 is about 1107.5378097383. The cubic root of 1226640 is about 107.0464758651.

The spelling of 1226640 in words is "one million, two hundred twenty-six thousand, six hundred forty".