1023890789 has 2 divisors, whose sum is σ = 1023890790. Its totient is φ = 1023890788.

The previous prime is 1023890771. The next prime is 1023890837. The reversal of 1023890789 is 9870983201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557762689 + 466128100 = 23617^2 + 21590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023890789 - 2⁸ = 1023890533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023890719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511945394 + 511945395.

It is an arithmetic number, because the mean of its divisors is an integer number (511945395).

Almost surely, 2^1023890789 is an apocalyptic number.

It is an amenable number.

1023890789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023890789 is an equidigital number, since it uses as much as digits as its factorization.

1023890789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 1023890789 is about 31998.2935326245. The cubic root of 1023890789 is about 1007.9010060280.

The spelling of 1023890789 in words is "one billion, twenty-three million, eight hundred ninety thousand, seven hundred eighty-nine".