1394685997 has 2 divisors, whose sum is σ = 1394685998. Its totient is φ = 1394685996.

The previous prime is 1394685989. The next prime is 1394686021. The reversal of 1394685997 is 7995864931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1126676356 + 268009641 = 33566^2 + 16371^2 .

It is a cyclic number.

It is not a de Polignac number, because 1394685997 - 2³ = 1394685989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1394685917) 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, 697342998 + 697342999.

It is an arithmetic number, because the mean of its divisors is an integer number (697342999).

Almost surely, 2^1394685997 is an apocalyptic number.

It is an amenable number.

1394685997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394685997 is an equidigital number, since it uses as much as digits as its factorization.

1394685997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 61.

The square root of 1394685997 is about 37345.4950027443. The cubic root of 1394685997 is about 1117.2717388002.

The spelling of 1394685997 in words is "one billion, three hundred ninety-four million, six hundred eighty-five thousand, nine hundred ninety-seven".