1381935240 has 144 divisors (see below), whose sum is σ = 5224627980. Its totient is φ = 315866880.

The previous prime is 1381935209. The next prime is 1381935257. The reversal of 1381935240 is 425391831.

1381935240 is a `hidden beast` number, since 1 + 381 + 9 + 35 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1375371396 + 6563844 = 37086^2 + 2562^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1381935195 and 1381935204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21531 + ... + 56810.

Almost surely, 2^1381935240 is an apocalyptic number.

1381935240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381935240 is an abundant number, since it is smaller than the sum of its proper divisors (3842692740).

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

1381935240 is a wasteful number, since it uses less digits than its factorization.

1381935240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78372 (or 78358 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1381935240 is about 37174.3895713164. The cubic root of 1381935240 is about 1113.8564666745.

The spelling of 1381935240 in words is "one billion, three hundred eighty-one million, nine hundred thirty-five thousand, two hundred forty".