1365861798 has 128 divisors (see below), whose sum is σ = 3603456000. Its totient is φ = 375269760.

The previous prime is 1365861769. The next prime is 1365861839. The reversal of 1365861798 is 8971685631.

1365861798 is a `hidden beast` number, since 13 + 6 + 5 + 8 + 617 + 9 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2683168 + ... + 2683676.

It is an arithmetic number, because the mean of its divisors is an integer number (28152000).

Almost surely, 2^1365861798 is an apocalyptic number.

1365861798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1365861798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1801728000).

1365861798 is an abundant number, since it is smaller than the sum of its proper divisors (2237594202).

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

1365861798 is a wasteful number, since it uses less digits than its factorization.

1365861798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787 (or 781 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 1365861798 is about 36957.5675335918. The cubic root of 1365861798 is about 1109.5211521133.

It can be divided in two parts, 136586 and 1798, that added together give a square (138384 = 372²).

The spelling of 1365861798 in words is "one billion, three hundred sixty-five million, eight hundred sixty-one thousand, seven hundred ninety-eight".