659139840 has 216 divisors, whose sum is σ = 2360390760. Its totient is φ = 169623552.

The previous prime is 659139823. The next prime is 659139841. The reversal of 659139840 is 48931956.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21678336 + 637461504 = 4656^2 + 25248^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659139841) 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, 333094 + ... + 335066.

It is an arithmetic number, because the mean of its divisors is an integer number (10927735).

Almost surely, 2^659139840 is an apocalyptic number.

659139840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 659139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1180195380).

659139840 is an abundant number, since it is smaller than the sum of its proper divisors (1701250920).

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

659139840 is a wasteful number, since it uses less digits than its factorization.

659139840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2012 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 659139840 is about 25673.7188580073. The cubic root of 659139840 is about 870.2803694075.

The spelling of 659139840 in words is "six hundred fifty-nine million, one hundred thirty-nine thousand, eight hundred forty".