1242311240 has 32 divisors (see below), whose sum is σ = 2797200000. Its totient is φ = 496569024.

The previous prime is 1242311221. The next prime is 1242311269. The reversal of 1242311240 is 421132421.

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, 49601 + ... + 70319.

It is an arithmetic number, because the mean of its divisors is an integer number (87412500).

Almost surely, 2^1242311240 is an apocalyptic number.

1242311240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242311240 is an abundant number, since it is smaller than the sum of its proper divisors (1554888760).

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

1242311240 is a wasteful number, since it uses less digits than its factorization.

1242311240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22229 (or 22225 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1242311240 is about 35246.4358481819. The cubic root of 1242311240 is about 1075.0041434850.

Adding to 1242311240 its reverse (421132421), we get a palindrome (1663443661).

The spelling of 1242311240 in words is "one billion, two hundred forty-two million, three hundred eleven thousand, two hundred forty".