1380641840 has 40 divisors (see below), whose sum is σ = 3378942960. Its totient is φ = 523190016.

The previous prime is 1380641833. The next prime is 1380641849. The reversal of 1380641840 is 481460831.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1380641840.

It is not an unprimeable number, because it can be changed into a prime (1380641849) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 452639 + ... + 455678.

It is an arithmetic number, because the mean of its divisors is an integer number (84473574).

Almost surely, 2^1380641840 is an apocalyptic number.

1380641840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1380641840 is an abundant number, since it is smaller than the sum of its proper divisors (1998301120).

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

1380641840 is a wasteful number, since it uses less digits than its factorization.

1380641840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908349 (or 908343 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 1380641840 is about 37156.9891137589. The cubic root of 1380641840 is about 1113.5088595410.

The spelling of 1380641840 in words is "one billion, three hundred eighty million, six hundred forty-one thousand, eight hundred forty".