1400644459 has 2 divisors, whose sum is σ = 1400644460. Its totient is φ = 1400644458.

The previous prime is 1400644439. The next prime is 1400644471. The reversal of 1400644459 is 9544460041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1400644459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1400644439) 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, 700322229 + 700322230.

It is an arithmetic number, because the mean of its divisors is an integer number (700322230).

Almost surely, 2^1400644459 is an apocalyptic number.

1400644459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400644459 is an equidigital number, since it uses as much as digits as its factorization.

1400644459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 1400644459 is about 37425.1848225229. The cubic root of 1400644459 is about 1118.8605703102.

The spelling of 1400644459 in words is "one billion, four hundred million, six hundred forty-four thousand, four hundred fifty-nine".