1320040605 has 64 divisors (see below), whose sum is σ = 2366300160. Its totient is φ = 623980800.

The previous prime is 1320040583. The next prime is 1320040651. The reversal of 1320040605 is 5060400231.

It is a happy number.

It is not a de Polignac number, because 1320040605 - 2⁵ = 1320040573 is a prime.

It is a super-3 number, since 3×1320040605³ (a number of 28 digits) contains 333 as substring.

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 63 ways as a sum of consecutive naturals, for example, 839470 + ... + 841040.

It is an arithmetic number, because the mean of its divisors is an integer number (36973440).

Almost surely, 2^1320040605 is an apocalyptic number.

1320040605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1320040605 is a deficient number, since it is larger than the sum of its proper divisors (1046259555).

1320040605 is a wasteful number, since it uses less digits than its factorization.

1320040605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1320040605 is about 36332.3630527936. The cubic root of 1320040605 is about 1096.9725583798.

Adding to 1320040605 its reverse (5060400231), we get a palindrome (6380440836).

The spelling of 1320040605 in words is "one billion, three hundred twenty million, forty thousand, six hundred five".