1026778389 has 32 divisors (see below), whose sum is σ = 1719379200. Its totient is φ = 541590336.

The previous prime is 1026778387. The next prime is 1026778399. The reversal of 1026778389 is 9838776201.

It is not a de Polignac number, because 1026778389 - 2¹ = 1026778387 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026778387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25002 + ... + 51755.

It is an arithmetic number, because the mean of its divisors is an integer number (53730600).

Almost surely, 2^1026778389 is an apocalyptic number.

It is an amenable number.

1026778389 is a deficient number, since it is larger than the sum of its proper divisors (692600811).

1026778389 is an equidigital number, since it uses as much as digits as its factorization.

1026778389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76794 (or 76780 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The square root of 1026778389 is about 32043.3829206593. The cubic root of 1026778389 is about 1008.8476184495.

The spelling of 1026778389 in words is "one billion, twenty-six million, seven hundred seventy-eight thousand, three hundred eighty-nine".