1405686749 has 2 divisors, whose sum is σ = 1405686750. Its totient is φ = 1405686748.

The previous prime is 1405686697. The next prime is 1405686767. The reversal of 1405686749 is 9476865041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902581849 + 503104900 = 30043^2 + 22430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405686749 - 2¹² = 1405682653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1405686697 and 1405686706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405686349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702843374 + 702843375.

It is an arithmetic number, because the mean of its divisors is an integer number (702843375).

Almost surely, 2^1405686749 is an apocalyptic number.

It is an amenable number.

1405686749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405686749 is an equidigital number, since it uses as much as digits as its factorization.

1405686749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 1405686749 is about 37492.4892345120. The cubic root of 1405686749 is about 1120.2015870669.

The spelling of 1405686749 in words is "one billion, four hundred five million, six hundred eighty-six thousand, seven hundred forty-nine".