1240423440 has 40 divisors (see below), whose sum is σ = 3845313408. Its totient is φ = 330779520.

The previous prime is 1240423439. The next prime is 1240423441. The reversal of 1240423440 is 443240421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1240423439) and next prime (1240423441).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×1240423440³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1240423440.

It is not an unprimeable number, because it can be changed into a prime (1240423441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2583976 + ... + 2584455.

Almost surely, 2^1240423440 is an apocalyptic number.

1240423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240423440 is an abundant number, since it is smaller than the sum of its proper divisors (2604889968).

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

1240423440 is a wasteful number, since it uses less digits than its factorization.

1240423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5168447 (or 5168441 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 1240423440 is about 35219.6456540948. The cubic root of 1240423440 is about 1074.4593466655.

Adding to 1240423440 its reverse (443240421), we get a palindrome (1683663861).

The spelling of 1240423440 in words is "one billion, two hundred forty million, four hundred twenty-three thousand, four hundred forty".