1222740 has 36 divisors (see below), whose sum is σ = 3709524. Its totient is φ = 326016.

The previous prime is 1222729. The next prime is 1222751. The reversal of 1222740 is 472221.

It is an interprime number because it is at equal distance from previous prime (1222729) and next prime (1222751).

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 956484 = 516^2 + 978^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3217 + ... + 3576.

2^1222740 is an apocalyptic number.

1222740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222740 is an abundant number, since it is smaller than the sum of its proper divisors (2486784).

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

1222740 is a wasteful number, since it uses less digits than its factorization.

1222740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6808 (or 6803 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1222740 is about 1105.7757458002. The cubic root of 1222740 is about 106.9329069592.

Adding to 1222740 its reverse (472221), we get a palindrome (1694961).

The spelling of 1222740 in words is "one million, two hundred twenty-two thousand, seven hundred forty".