1396781568 has 240 divisors, whose sum is σ = 4962974016. Its totient is φ = 368271360.

The previous prime is 1396781543. The next prime is 1396781569. The reversal of 1396781568 is 8651876931.

1396781568 is a `hidden beast` number, since 1 + 3 + 9 + 6 + 78 + 1 + 568 = 666.

It is not an unprimeable number, because it can be changed into a prime (1396781569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 417663 + ... + 420993.

Almost surely, 2^1396781568 is an apocalyptic number.

1396781568 is a gapful number since it is divisible by the number (18) 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 1396781568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2481487008).

1396781568 is an abundant number, since it is smaller than the sum of its proper divisors (3566192448).

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

1396781568 is a wasteful number, since it uses less digits than its factorization.

1396781568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375 (or 3356 counting only the distinct ones).

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

The square root of 1396781568 is about 37373.5410150015. The cubic root of 1396781568 is about 1117.8310404625.

It can be divided in two parts, 139678 and 1568, that added together give a triangular number (141246 = T₅₃₁).

The spelling of 1396781568 in words is "one billion, three hundred ninety-six million, seven hundred eighty-one thousand, five hundred sixty-eight".