689193940 has 48 divisors (see below), whose sum is σ = 1541432592. Its totient is φ = 257939456.

The previous prime is 689193917. The next prime is 689193971. The reversal of 689193940 is 49391986.

It can be written as a sum of positive squares in 8 ways, for example, as 1285956 + 687907984 = 1134^2 + 26228^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52962 + ... + 64678.

It is an arithmetic number, because the mean of its divisors is an integer number (32113179).

Almost surely, 2^689193940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689193940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770716296).

689193940 is an abundant number, since it is smaller than the sum of its proper divisors (852238652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689193940 is a wasteful number, since it uses less digits than its factorization.

689193940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11916 (or 11914 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 689193940 is about 26252.5034996665. The cubic root of 689193940 is about 883.3113618205.

The spelling of 689193940 in words is "six hundred eighty-nine million, one hundred ninety-three thousand, nine hundred forty".