1240540240 has 40 divisors (see below), whose sum is σ = 2912277888. Its totient is φ = 491395200.

The previous prime is 1240540219. The next prime is 1240540247. The reversal of 1240540240 is 420450421.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240540247) 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, 67036 + ... + 83515.

Almost surely, 2^1240540240 is an apocalyptic number.

1240540240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240540240 is an abundant number, since it is smaller than the sum of its proper divisors (1671737648).

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

1240540240 is a wasteful number, since it uses less digits than its factorization.

1240540240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150667 (or 150661 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 1240540240 is about 35221.3037805246. The cubic root of 1240540240 is about 1074.4930698036.

Adding to 1240540240 its reverse (420450421), we get a palindrome (1660990661).

The spelling of 1240540240 in words is "one billion, two hundred forty million, five hundred forty thousand, two hundred forty".