1205424340 has 12 divisors (see below), whose sum is σ = 2531391156. Its totient is φ = 482169728.

The previous prime is 1205424329. The next prime is 1205424349. The reversal of 1205424340 is 434245021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 141229456 + 1064194884 = 11884^2 + 32622^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205424349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30135589 + ... + 30135628.

It is an arithmetic number, because the mean of its divisors is an integer number (210949263).

Almost surely, 2^1205424340 is an apocalyptic number.

1205424340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205424340 is an abundant number, since it is smaller than the sum of its proper divisors (1325966816).

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

1205424340 is a wasteful number, since it uses less digits than its factorization.

1205424340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60271226 (or 60271224 counting only the distinct ones).

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

The square root of 1205424340 is about 34719.2214774468. The cubic root of 1205424340 is about 1064.2573352449.

Adding to 1205424340 its reverse (434245021), we get a palindrome (1639669361).

The spelling of 1205424340 in words is "one billion, two hundred five million, four hundred twenty-four thousand, three hundred forty".