1235440240 has 20 divisors (see below), whose sum is σ = 2872398744. Its totient is φ = 494176064.

The previous prime is 1235440231. The next prime is 1235440243. The reversal of 1235440240 is 420445321.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1235440240² = 3052625173222515200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235440243) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7721422 + ... + 7721581.

Almost surely, 2^1235440240 is an apocalyptic number.

1235440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1235440240 is an abundant number, since it is smaller than the sum of its proper divisors (1636958504).

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

1235440240 is a wasteful number, since it uses less digits than its factorization.

1235440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15443016 (or 15443010 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 1235440240 is about 35148.8298525001. The cubic root of 1235440240 is about 1073.0185935521.

Adding to 1235440240 its reverse (420445321), we get a palindrome (1655885561).

The spelling of 1235440240 in words is "one billion, two hundred thirty-five million, four hundred forty thousand, two hundred forty".