1305402840 has 96 divisors (see below), whose sum is σ = 4848648480. Its totient is φ = 298377216.

The previous prime is 1305402811. The next prime is 1305402841. The reversal of 1305402840 is 482045031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305402841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256489 + ... + 261528.

It is an arithmetic number, because the mean of its divisors is an integer number (50506755).

Almost surely, 2^1305402840 is an apocalyptic number.

1305402840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305402840 is an abundant number, since it is smaller than the sum of its proper divisors (3543245640).

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

1305402840 is a wasteful number, since it uses less digits than its factorization.

1305402840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518041 (or 518034 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1305402840 is about 36130.3589796725. The cubic root of 1305402840 is about 1092.9027474424.

Adding to 1305402840 its reverse (482045031), we get a palindrome (1787447871).

The spelling of 1305402840 in words is "one billion, three hundred five million, four hundred two thousand, eight hundred forty".