1223140440 has 32 divisors (see below), whose sum is σ = 3669421680. Its totient is φ = 326170752.

The previous prime is 1223140421. The next prime is 1223140469. The reversal of 1223140440 is 440413221.

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, 5096299 + ... + 5096538.

Almost surely, 2^1223140440 is an apocalyptic number.

1223140440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223140440 is an abundant number, since it is smaller than the sum of its proper divisors (2446281240).

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

1223140440 is a wasteful number, since it uses less digits than its factorization.

1223140440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10192851 (or 10192847 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1223140440 is about 34973.4247679577. The cubic root of 1223140440 is about 1069.4457897988.

Adding to 1223140440 its reverse (440413221), we get a palindrome (1663553661).

The spelling of 1223140440 in words is "one billion, two hundred twenty-three million, one hundred forty thousand, four hundred forty".