1028694397 has 2 divisors, whose sum is σ = 1028694398. Its totient is φ = 1028694396.

The previous prime is 1028694379. The next prime is 1028694427. The reversal of 1028694397 is 7934968201.

Together with previous prime (1028694379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 987593476 + 41100921 = 31426^2 + 6411^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028694397 - 2²³ = 1020305789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1028694397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028694377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514347198 + 514347199.

It is an arithmetic number, because the mean of its divisors is an integer number (514347199).

Almost surely, 2^1028694397 is an apocalyptic number.

It is an amenable number.

1028694397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028694397 is an equidigital number, since it uses as much as digits as its factorization.

1028694397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 1028694397 is about 32073.2660794001. The cubic root of 1028694397 is about 1009.4747446945.

The spelling of 1028694397 in words is "one billion, twenty-eight million, six hundred ninety-four thousand, three hundred ninety-seven".