1240210420 has 12 divisors (see below), whose sum is σ = 2604441924. Its totient is φ = 496084160.

The previous prime is 1240210409. The next prime is 1240210421. The reversal of 1240210420 is 240120421.

It can be written as a sum of positive squares in 2 ways, for example, as 804403044 + 435807376 = 28362^2 + 20876^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1240210394 and 1240210403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240210421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31005241 + ... + 31005280.

It is an arithmetic number, because the mean of its divisors is an integer number (217036827).

Almost surely, 2^1240210420 is an apocalyptic number.

1240210420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240210420 is an abundant number, since it is smaller than the sum of its proper divisors (1364231504).

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

1240210420 is a wasteful number, since it uses less digits than its factorization.

1240210420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62010530 (or 62010528 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1240210420 is about 35216.6213598068. The cubic root of 1240210420 is about 1074.3978369085.

Adding to 1240210420 its reverse (240120421), we get a palindrome (1480330841).

It can be divided in two parts, 12402 and 10420, that added together give a palindrome (22822).

The spelling of 1240210420 in words is "one billion, two hundred forty million, two hundred ten thousand, four hundred twenty".