1222431540 has 144 divisors (see below), whose sum is σ = 3789006144. Its totient is φ = 294243840.

The previous prime is 1222431533. The next prime is 1222431569. The reversal of 1222431540 is 451342221.

It is a self number, because there is not a number n which added to its sum of digits gives 1222431540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1182864 + ... + 1183896.

Almost surely, 2^1222431540 is an apocalyptic number.

1222431540 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 1222431540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1894503072).

1222431540 is an abundant number, since it is smaller than the sum of its proper divisors (2566574604).

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

1222431540 is a wasteful number, since it uses less digits than its factorization.

1222431540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1222431540 is about 34963.2884608985. The cubic root of 1222431540 is about 1069.2391423290.

Adding to 1222431540 its reverse (451342221), we get a palindrome (1673773761).

The spelling of 1222431540 in words is "one billion, two hundred twenty-two million, four hundred thirty-one thousand, five hundred forty".