1028138357 has 4 divisors (see below), whose sum is σ = 1028850336. Its totient is φ = 1027426380.

The previous prime is 1028138303. The next prime is 1028138401. The reversal of 1028138357 is 7538318201.

It is a happy number.

1028138357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7538318201 = 233 ⋅32353297.

It is a cyclic number.

It is not a de Polignac number, because 1028138357 - 2¹⁶ = 1028072821 is a prime.

It is a super-2 number, since 2×1028138357² = 2114136962269318898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1028138357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028134357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353819 + ... + 356712.

It is an arithmetic number, because the mean of its divisors is an integer number (257212584).

Almost surely, 2^1028138357 is an apocalyptic number.

It is an amenable number.

1028138357 is a deficient number, since it is larger than the sum of its proper divisors (711979).

1028138357 is an equidigital number, since it uses as much as digits as its factorization.

1028138357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711978.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1028138357 is about 32064.5966293044. The cubic root of 1028138357 is about 1009.2928281786.

The spelling of 1028138357 in words is "one billion, twenty-eight million, one hundred thirty-eight thousand, three hundred fifty-seven".