1305111640 has 32 divisors (see below), whose sum is σ = 3356002080. Its totient is φ = 447466752.

The previous prime is 1305111637. The next prime is 1305111659. The reversal of 1305111640 is 461115031.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2330277 + ... + 2330836.

It is an arithmetic number, because the mean of its divisors is an integer number (104875065).

Almost surely, 2^1305111640 is an apocalyptic number.

1305111640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305111640 is an abundant number, since it is smaller than the sum of its proper divisors (2050890440).

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

1305111640 is a wasteful number, since it uses less digits than its factorization.

1305111640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661131 (or 4661127 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1305111640 is about 36126.3289028930. The cubic root of 1305111640 is about 1092.8214757364.

Adding to 1305111640 its reverse (461115031), we get a palindrome (1766226671).

The spelling of 1305111640 in words is "one billion, three hundred five million, one hundred eleven thousand, six hundred forty".