1340422381 has 2 divisors, whose sum is σ = 1340422382. Its totient is φ = 1340422380.

The previous prime is 1340422351. The next prime is 1340422397. The reversal of 1340422381 is 1832240431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1148599881 + 191822500 = 33891^2 + 13850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340422381 - 2²⁵ = 1306867949 is a prime.

It is a super-2 number, since 2×1340422381² = 3593464318971418322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340422331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670211190 + 670211191.

It is an arithmetic number, because the mean of its divisors is an integer number (670211191).

Almost surely, 2^1340422381 is an apocalyptic number.

It is an amenable number.

1340422381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340422381 is an equidigital number, since it uses as much as digits as its factorization.

1340422381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1340422381 is about 36611.7792656954. The cubic root of 1340422381 is about 1102.5895960904.

The spelling of 1340422381 in words is "one billion, three hundred forty million, four hundred twenty-two thousand, three hundred eighty-one".