1380725021 has 16 divisors (see below), whose sum is σ = 1517718720. Its totient is φ = 1248289920.

The previous prime is 1380725011. The next prime is 1380725033. The reversal of 1380725021 is 1205270831.

It is a cyclic number.

It is not a de Polignac number, because 1380725021 - 2⁶ = 1380724957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380725011) 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 15 ways as a sum of consecutive naturals, for example, 213881 + ... + 220241.

It is an arithmetic number, because the mean of its divisors is an integer number (94857420).

Almost surely, 2^1380725021 is an apocalyptic number.

It is an amenable number.

1380725021 is a deficient number, since it is larger than the sum of its proper divisors (136993699).

1380725021 is a wasteful number, since it uses less digits than its factorization.

1380725021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6716.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1380725021 is about 37158.1084152571. The cubic root of 1380725021 is about 1113.5312213435.

Adding to 1380725021 its reverse (1205270831), we get a palindrome (2585995852).

The spelling of 1380725021 in words is "one billion, three hundred eighty million, seven hundred twenty-five thousand, twenty-one".