1394427989 has 2 divisors, whose sum is σ = 1394427990. Its totient is φ = 1394427988.

The previous prime is 1394427949. The next prime is 1394427997. The reversal of 1394427989 is 9897244931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1394424964 + 3025 = 37342^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 1394427989 - 2⁸ = 1394427733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1394427949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697213994 + 697213995.

It is an arithmetic number, because the mean of its divisors is an integer number (697213995).

Almost surely, 2^1394427989 is an apocalyptic number.

It is an amenable number.

1394427989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394427989 is an equidigital number, since it uses as much as digits as its factorization.

1394427989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

The square root of 1394427989 is about 37342.0405039682. The cubic root of 1394427989 is about 1117.2028385065.

The spelling of 1394427989 in words is "one billion, three hundred ninety-four million, four hundred twenty-seven thousand, nine hundred eighty-nine".