1305043640 has 16 divisors (see below), whose sum is σ = 2936348280. Its totient is φ = 522017440.

The previous prime is 1305043637. The next prime is 1305043693. The reversal of 1305043640 is 463405031.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16313006 + ... + 16313085.

Almost surely, 2^1305043640 is an apocalyptic number.

1305043640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305043640 is an abundant number, since it is smaller than the sum of its proper divisors (1631304640).

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

1305043640 is a wasteful number, since it uses less digits than its factorization.

1305043640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32626102 (or 32626098 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1305043640 is about 36125.3877487841. The cubic root of 1305043640 is about 1092.8024957123.

Adding to 1305043640 its reverse (463405031), we get a palindrome (1768448671).

The spelling of 1305043640 in words is "one billion, three hundred five million, forty-three thousand, six hundred forty".