689181838 has 4 divisors (see below), whose sum is σ = 1033772760. Its totient is φ = 344590918.

The previous prime is 689181827. The next prime is 689181881. The reversal of 689181838 is 838181986.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172295458 + ... + 172295461.

It is an arithmetic number, because the mean of its divisors is an integer number (258443190).

Almost surely, 2^689181838 is an apocalyptic number.

689181838 is a deficient number, since it is larger than the sum of its proper divisors (344590922).

689181838 is a wasteful number, since it uses less digits than its factorization.

689181838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344590921.

The product of its digits is 663552, while the sum is 52.

The square root of 689181838 is about 26252.2730063513. The cubic root of 689181838 is about 883.3061915793.

It can be divided in two parts, 68918 and 1838, that added together give a square (70756 = 266²).

The spelling of 689181838 in words is "six hundred eighty-nine million, one hundred eighty-one thousand, eight hundred thirty-eight".