1240205000 has 40 divisors (see below), whose sum is σ = 2905812030. Its totient is φ = 496080000.

The previous prime is 1240204991. The next prime is 1240205009. The reversal of 1240205000 is 5020421.

It is an interprime number because it is at equal distance from previous prime (1240204991) and next prime (1240205009).

It can be written as a sum of positive squares in 5 ways, for example, as 198077476 + 1042127524 = 14074^2 + 32282^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1240205009) 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 9 ways as a sum of consecutive naturals, for example, 119021 + ... + 129020.

Almost surely, 2^1240205000 is an apocalyptic number.

1240205000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240205000 is an abundant number, since it is smaller than the sum of its proper divisors (1665607030).

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

1240205000 is an equidigital number, since it uses as much as digits as its factorization.

1240205000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248067 (or 248048 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1240205000 is about 35216.5444074231. The cubic root of 1240205000 is about 1074.3962717857.

Adding to 1240205000 its reverse (5020421), we get a palindrome (1245225421).

The spelling of 1240205000 in words is "one billion, two hundred forty million, two hundred five thousand".