1394432657 has 2 divisors, whose sum is σ = 1394432658. Its totient is φ = 1394432656.

The previous prime is 1394432623. The next prime is 1394432659. The reversal of 1394432657 is 7562344931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980879761 + 413552896 = 31319^2 + 20336^2 .

It is an emirp because it is prime and its reverse (7562344931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1394432657 is a prime.

Together with 1394432659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1394432659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697216328 + 697216329.

It is an arithmetic number, because the mean of its divisors is an integer number (697216329).

Almost surely, 2^1394432657 is an apocalyptic number.

It is an amenable number.

1394432657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394432657 is an equidigital number, since it uses as much as digits as its factorization.

1394432657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 44.

The square root of 1394432657 is about 37342.1030071955. The cubic root of 1394432657 is about 1117.2040851579.

The spelling of 1394432657 in words is "one billion, three hundred ninety-four million, four hundred thirty-two thousand, six hundred fifty-seven".