1240245321 has 48 divisors (see below), whose sum is σ = 1952759808. Its totient is φ = 698090400.

The previous prime is 1240245287. The next prime is 1240245323. The reversal of 1240245321 is 1235420421.

It is not a de Polignac number, because 1240245321 - 2⁶ = 1240245257 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1240245291 and 1240245300.

It is not an unprimeable number, because it can be changed into a prime (1240245323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4576416 + ... + 4576686.

It is an arithmetic number, because the mean of its divisors is an integer number (40682496).

Almost surely, 2^1240245321 is an apocalyptic number.

It is an amenable number.

1240245321 is a deficient number, since it is larger than the sum of its proper divisors (712514487).

1240245321 is a wasteful number, since it uses less digits than its factorization.

1240245321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 635 counting only the distinct ones).

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

The square root of 1240245321 is about 35217.1168751788. The cubic root of 1240245321 is about 1074.4079150927.

Adding to 1240245321 its reverse (1235420421), we get a palindrome (2475665742).

The spelling of 1240245321 in words is "one billion, two hundred forty million, two hundred forty-five thousand, three hundred twenty-one".