1227640 has 32 divisors (see below), whose sum is σ = 2825280. Its totient is φ = 479872.

The previous prime is 1227637. The next prime is 1227649. The reversal of 1227640 is 467221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1227649) 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, 1554 + ... + 2206.

It is an arithmetic number, because the mean of its divisors is an integer number (88290).

2^1227640 is an apocalyptic number.

1227640 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 1227640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1412640).

1227640 is an abundant number, since it is smaller than the sum of its proper divisors (1597640).

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

1227640 is a wasteful number, since it uses less digits than its factorization.

1227640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1227640 is about 1107.9891696222. The cubic root of 1227640 is about 107.0755573124.

The spelling of 1227640 in words is "one million, two hundred twenty-seven thousand, six hundred forty".