1240565440 has 112 divisors (see below), whose sum is σ = 3089940480. Its totient is φ = 473840640.

The previous prime is 1240565401. The next prime is 1240565483. The reversal of 1240565440 is 445650421.

It is a happy number.

It is a super-2 number, since 2×1240565440² = 3078005221844787200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 782889 + ... + 784471.

Almost surely, 2^1240565440 is an apocalyptic number.

1240565440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1240565440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544970240).

1240565440 is an abundant number, since it is smaller than the sum of its proper divisors (1849375040).

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

1240565440 is a wasteful number, since it uses less digits than its factorization.

1240565440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 1240565440 is about 35221.6615167428. The cubic root of 1240565440 is about 1074.5003454086.

The spelling of 1240565440 in words is "one billion, two hundred forty million, five hundred sixty-five thousand, four hundred forty".