1242230440 has 64 divisors (see below), whose sum is σ = 3120068160. Its totient is φ = 441208320.

The previous prime is 1242230387. The next prime is 1242230447. The reversal of 1242230440 is 440322421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1242230447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13909 + ... + 51748.

It is an arithmetic number, because the mean of its divisors is an integer number (48751065).

Almost surely, 2^1242230440 is an apocalyptic number.

1242230440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242230440 is an abundant number, since it is smaller than the sum of its proper divisors (1877837720).

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

1242230440 is a wasteful number, since it uses less digits than its factorization.

1242230440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65722 (or 65718 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 1242230440 is about 35245.2896143584. The cubic root of 1242230440 is about 1074.9808368677.

Adding to 1242230440 its reverse (440322421), we get a palindrome (1682552861).

The spelling of 1242230440 in words is "one billion, two hundred forty-two million, two hundred thirty thousand, four hundred forty".