1394694689 has 2 divisors, whose sum is σ = 1394694690. Its totient is φ = 1394694688.

The previous prime is 1394694647. The next prime is 1394694737. The reversal of 1394694689 is 9864964931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151584225 + 243110464 = 33935^2 + 15592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1394694689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1394694289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697347344 + 697347345.

It is an arithmetic number, because the mean of its divisors is an integer number (697347345).

Almost surely, 2^1394694689 is an apocalyptic number.

It is an amenable number.

1394694689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394694689 is an equidigital number, since it uses as much as digits as its factorization.

1394694689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 59.

The square root of 1394694689 is about 37345.6113753678. The cubic root of 1394694689 is about 1117.2740598258.

The spelling of 1394694689 in words is "one billion, three hundred ninety-four million, six hundred ninety-four thousand, six hundred eighty-nine".