1406382781 has 2 divisors, whose sum is σ = 1406382782. Its totient is φ = 1406382780.

The previous prime is 1406382763. The next prime is 1406382787. The reversal of 1406382781 is 1872836041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1396516900 + 9865881 = 37370^2 + 3141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406382781 - 2¹⁵ = 1406350013 is a prime.

It is a super-2 number, since 2×1406382781² = 3955825053386587922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1406382787) 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, 703191390 + 703191391.

It is an arithmetic number, because the mean of its divisors is an integer number (703191391).

Almost surely, 2^1406382781 is an apocalyptic number.

It is an amenable number.

1406382781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406382781 is an equidigital number, since it uses as much as digits as its factorization.

1406382781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1406382781 is about 37501.7703715438. The cubic root of 1406382781 is about 1120.3864474794.

The spelling of 1406382781 in words is "one billion, four hundred six million, three hundred eighty-two thousand, seven hundred eighty-one".