1231222340 has 24 divisors (see below), whose sum is σ = 2640580992. Its totient is φ = 482010080.

The previous prime is 1231222339. The next prime is 1231222367. The reversal of 1231222340 is 432221321.

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

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, 653966 + ... + 655845.

It is an arithmetic number, because the mean of its divisors is an integer number (110024208).

Almost surely, 2^1231222340 is an apocalyptic number.

1231222340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231222340 is an abundant number, since it is smaller than the sum of its proper divisors (1409358652).

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

1231222340 is a wasteful number, since it uses less digits than its factorization.

1231222340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309867 (or 1309865 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1231222340 is about 35088.7779781514. Note that the first 3 decimals coincide. The cubic root of 1231222340 is about 1071.7960750904.

Adding to 1231222340 its reverse (432221321), we get a palindrome (1663443661).

The spelling of 1231222340 in words is "one billion, two hundred thirty-one million, two hundred twenty-two thousand, three hundred forty".