1205153240 has 32 divisors (see below), whose sum is σ = 2716655760. Its totient is φ = 481161600.

The previous prime is 1205153227. The next prime is 1205153263. The reversal of 1205153240 is 423515021.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6206 + ... + 49485.

Almost surely, 2^1205153240 is an apocalyptic number.

1205153240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205153240 is an abundant number, since it is smaller than the sum of its proper divisors (1511502520).

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

1205153240 is a wasteful number, since it uses less digits than its factorization.

1205153240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56243 (or 56239 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1205153240 is about 34715.3170805050. The cubic root of 1205153240 is about 1064.1775454187.

Adding to 1205153240 its reverse (423515021), we get a palindrome (1628668261).

The spelling of 1205153240 in words is "one billion, two hundred five million, one hundred fifty-three thousand, two hundred forty".