1223612240 has 20 divisors (see below), whose sum is σ = 2844898644. Its totient is φ = 489444864.

The previous prime is 1223612231. The next prime is 1223612261. The reversal of 1223612240 is 422163221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 691479616 + 532132624 = 26296^2 + 23068^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7647497 + ... + 7647656.

Almost surely, 2^1223612240 is an apocalyptic number.

1223612240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223612240 is an abundant number, since it is smaller than the sum of its proper divisors (1621286404).

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

1223612240 is a wasteful number, since it uses less digits than its factorization.

1223612240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15295166 (or 15295160 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1223612240 is about 34980.1692391561. The cubic root of 1223612240 is about 1069.5832773258.

Adding to 1223612240 its reverse (422163221), we get a palindrome (1645775461).

The spelling of 1223612240 in words is "one billion, two hundred twenty-three million, six hundred twelve thousand, two hundred forty".