1243061240 has 32 divisors (see below), whose sum is σ = 2798087760. Its totient is φ = 497011200.

The previous prime is 1243061231. The next prime is 1243061279. The reversal of 1243061240 is 421603421.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115280 + ... + 125600.

Almost surely, 2^1243061240 is an apocalyptic number.

1243061240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243061240 is an abundant number, since it is smaller than the sum of its proper divisors (1555026520).

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

1243061240 is a wasteful number, since it uses less digits than its factorization.

1243061240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13343 (or 13339 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1243061240 is about 35257.0736165099. The cubic root of 1243061240 is about 1075.2204314509.

Adding to 1243061240 its reverse (421603421), we get a palindrome (1664664661).

The spelling of 1243061240 in words is "one billion, two hundred forty-three million, sixty-one thousand, two hundred forty".