1235420240 has 40 divisors (see below), whose sum is σ = 2875435008. Its totient is φ = 493637760.

The previous prime is 1235420233. The next prime is 1235420257. The reversal of 1235420240 is 420245321.

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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71489 + ... + 87071.

Almost surely, 2^1235420240 is an apocalyptic number.

1235420240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1235420240 is an abundant number, since it is smaller than the sum of its proper divisors (1640014768).

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

1235420240 is a wasteful number, since it uses less digits than its factorization.

1235420240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16587 (or 16581 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 1235420240 is about 35148.5453468561. The cubic root of 1235420240 is about 1073.0128033117.

Adding to 1235420240 its reverse (420245321), we get a palindrome (1655665561).

The spelling of 1235420240 in words is "one billion, two hundred thirty-five million, four hundred twenty thousand, two hundred forty".