1242321040 has 20 divisors (see below), whose sum is σ = 2888396604. Its totient is φ = 496928384.

The previous prime is 1242321013. The next prime is 1242321049. The reversal of 1242321040 is 401232421.

It can be written as a sum of positive squares in 2 ways, for example, as 269879184 + 972441856 = 16428^2 + 31184^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1242320999 and 1242321017.

It is not an unprimeable number, because it can be changed into a prime (1242321049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7764427 + ... + 7764586.

Almost surely, 2^1242321040 is an apocalyptic number.

1242321040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242321040 is an abundant number, since it is smaller than the sum of its proper divisors (1646075564).

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

1242321040 is a wasteful number, since it uses less digits than its factorization.

1242321040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15529026 (or 15529020 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1242321040 is about 35246.5748690564. The cubic root of 1242321040 is about 1075.0069702090.

Adding to 1242321040 its reverse (401232421), we get a palindrome (1643553461).

The spelling of 1242321040 in words is "one billion, two hundred forty-two million, three hundred twenty-one thousand, forty".