1305897840 has 480 divisors, whose sum is σ = 5191542720. Its totient is φ = 291078144.

The previous prime is 1305897787. The next prime is 1305897877. The reversal of 1305897840 is 487985031.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 95 ways as a sum of consecutive naturals, for example, 4614339 + ... + 4614621.

It is an arithmetic number, because the mean of its divisors is an integer number (10815714).

Almost surely, 2^1305897840 is an apocalyptic number.

1305897840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1305897840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2595771360).

1305897840 is an abundant number, since it is smaller than the sum of its proper divisors (3885644880).

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

1305897840 is a wasteful number, since it uses less digits than its factorization.

1305897840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1305897840 is about 36137.2085252860. The cubic root of 1305897840 is about 1093.0408704489.

The spelling of 1305897840 in words is "one billion, three hundred five million, eight hundred ninety-seven thousand, eight hundred forty".