1368581840 has 20 divisors (see below), whose sum is σ = 3181952964. Its totient is φ = 547432704.

The previous prime is 1368581803. The next prime is 1368581843. The reversal of 1368581840 is 481858631.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 443692096 + 924889744 = 21064^2 + 30412^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1368581791 and 1368581800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1368581843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8553557 + ... + 8553716.

Almost surely, 2^1368581840 is an apocalyptic number.

1368581840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1368581840 is an abundant number, since it is smaller than the sum of its proper divisors (1813371124).

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

1368581840 is a wasteful number, since it uses less digits than its factorization.

1368581840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17107286 (or 17107280 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 1368581840 is about 36994.3487576143. The cubic root of 1368581840 is about 1110.2571814326.

The spelling of 1368581840 in words is "one billion, three hundred sixty-eight million, five hundred eighty-one thousand, eight hundred forty".