1028946389 has 8 divisors (see below), whose sum is σ = 1063377408. Its totient is φ = 994592880.

The previous prime is 1028946383. The next prime is 1028946409. The reversal of 1028946389 is 9836498201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028946389 is a prime.

It is a super-2 number, since 2×1028946389² = 2117461342872278642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028946383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8264 + ... + 46110.

It is an arithmetic number, because the mean of its divisors is an integer number (132922176).

Almost surely, 2^1028946389 is an apocalyptic number.

It is an amenable number.

1028946389 is a deficient number, since it is larger than the sum of its proper divisors (34431019).

1028946389 is an equidigital number, since it uses as much as digits as its factorization.

1028946389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38755.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 1028946389 is about 32077.1942195698. The cubic root of 1028946389 is about 1009.5571659307.

The spelling of 1028946389 in words is "one billion, twenty-eight million, nine hundred forty-six thousand, three hundred eighty-nine".