1223142140 has 24 divisors (see below), whose sum is σ = 2802107952. Its totient is φ = 444778880.

The previous prime is 1223142127. The next prime is 1223142187. The reversal of 1223142140 is 412413221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2779649 + ... + 2780088.

It is an arithmetic number, because the mean of its divisors is an integer number (116754498).

Almost surely, 2^1223142140 is an apocalyptic number.

1223142140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223142140 is an abundant number, since it is smaller than the sum of its proper divisors (1578965812).

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

1223142140 is a wasteful number, since it uses less digits than its factorization.

1223142140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5559757 (or 5559755 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1223142140 is about 34973.4490721176. The cubic root of 1223142140 is about 1069.4462852604.

Adding to 1223142140 its reverse (412413221), we get a palindrome (1635555361).

The spelling of 1223142140 in words is "one billion, two hundred twenty-three million, one hundred forty-two thousand, one hundred forty".