1399882181 has 2 divisors, whose sum is σ = 1399882182. Its totient is φ = 1399882180.

The previous prime is 1399882139. The next prime is 1399882213. The reversal of 1399882181 is 1812889931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1399433281 + 448900 = 37409^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399882181 - 2⁶ = 1399882117 is a prime.

It is a super-2 number, since 2×1399882181² = 3919340241362633522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399882111) 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 as a sum of consecutive naturals, namely, 699941090 + 699941091.

It is an arithmetic number, because the mean of its divisors is an integer number (699941091).

Almost surely, 2^1399882181 is an apocalyptic number.

It is an amenable number.

1399882181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399882181 is an equidigital number, since it uses as much as digits as its factorization.

1399882181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 50.

The square root of 1399882181 is about 37414.9994120005. Note that the first 3 decimals coincide. The cubic root of 1399882181 is about 1118.6575595790.

The spelling of 1399882181 in words is "one billion, three hundred ninety-nine million, eight hundred eighty-two thousand, one hundred eighty-one".