168657940 has 48 divisors (see below), whose sum is σ = 389015424. Its totient is φ = 60912000.

The previous prime is 168657871. The next prime is 168657943. The reversal of 168657940 is 49756861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168657943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30682 + ... + 35758.

It is an arithmetic number, because the mean of its divisors is an integer number (8104488).

Almost surely, 2^168657940 is an apocalyptic number.

168657940 is a gapful number since it is divisible by the number (10) 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 168657940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194507712).

168657940 is an abundant number, since it is smaller than the sum of its proper divisors (220357484).

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

168657940 is a wasteful number, since it uses less digits than its factorization.

168657940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5248 (or 5246 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 168657940 is about 12986.8371823166. The cubic root of 168657940 is about 552.5042170532.

The spelling of 168657940 in words is "one hundred sixty-eight million, six hundred fifty-seven thousand, nine hundred forty".