1018378769 has 4 divisors (see below), whose sum is σ = 1018530996. Its totient is φ = 1018226544.

The previous prime is 1018378759. The next prime is 1018378771. The reversal of 1018378769 is 9678738101.

1018378769 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 an emirpimes, since its reverse is a distinct semiprime: 9678738101 = 5869 ⋅1649129.

It can be written as a sum of positive squares in 2 ways, for example, as 856147600 + 162231169 = 29260^2 + 12737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1018378769 is a prime.

It is a super-2 number, since 2×1018378769² = 2074190634299910722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1018378759) 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, 65594 + ... + 79619.

It is an arithmetic number, because the mean of its divisors is an integer number (254632749).

Almost surely, 2^1018378769 is an apocalyptic number.

It is an amenable number.

1018378769 is a deficient number, since it is larger than the sum of its proper divisors (152227).

1018378769 is an equidigital number, since it uses as much as digits as its factorization.

1018378769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152226.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 1018378769 is about 31912.0473959287. The cubic root of 1018378769 is about 1006.0891038915.

The spelling of 1018378769 in words is "one billion, eighteen million, three hundred seventy-eight thousand, seven hundred sixty-nine".