518920389 has 24 divisors (see below), whose sum is σ = 809128320. Its totient is φ = 318576672.

The previous prime is 518920321. The next prime is 518920397. The reversal of 518920389 is 983029815.

It is a happy number.

It is not a de Polignac number, because 518920389 - 2¹⁷ = 518789317 is a prime.

It is a super-2 number, since 2×518920389² = 538556740239822642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518920309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46312 + ... + 56414.

It is an arithmetic number, because the mean of its divisors is an integer number (33713680).

Almost surely, 2^518920389 is an apocalyptic number.

It is an amenable number.

518920389 is a deficient number, since it is larger than the sum of its proper divisors (290207931).

518920389 is a wasteful number, since it uses less digits than its factorization.

518920389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561 (or 10558 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 518920389 is about 22779.8241652564. The cubic root of 518920389 is about 803.5882507784.

The spelling of 518920389 in words is "five hundred eighteen million, nine hundred twenty thousand, three hundred eighty-nine".