1380939851 has 2 divisors, whose sum is σ = 1380939852. Its totient is φ = 1380939850.

The previous prime is 1380939827. The next prime is 1380939877. The reversal of 1380939851 is 1589390831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1380939851 - 2⁶ = 1380939787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1380939796 and 1380939805.

It is not a weakly prime, because it can be changed into another prime (1380939151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690469925 + 690469926.

It is an arithmetic number, because the mean of its divisors is an integer number (690469926).

Almost surely, 2^1380939851 is an apocalyptic number.

1380939851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380939851 is an equidigital number, since it uses as much as digits as its factorization.

1380939851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1380939851 is about 37160.9990581524. Note that the first 3 decimals coincide. The cubic root of 1380939851 is about 1113.5889705942.

The spelling of 1380939851 in words is "one billion, three hundred eighty million, nine hundred thirty-nine thousand, eight hundred fifty-one".