168388740 has 288 divisors, whose sum is σ = 606533760. Its totient is φ = 38541312.

The previous prime is 168388709. The next prime is 168388747. The reversal of 168388740 is 47883861.

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 (168388747) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2028739 + ... + 2028821.

It is an arithmetic number, because the mean of its divisors is an integer number (2106020).

Almost surely, 2^168388740 is an apocalyptic number.

168388740 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 168388740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303266880).

168388740 is an abundant number, since it is smaller than the sum of its proper divisors (438145020).

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

168388740 is a wasteful number, since it uses less digits than its factorization.

168388740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 168388740 is about 12976.4687030024. The cubic root of 168388740 is about 552.2101043292.

The spelling of 168388740 in words is "one hundred sixty-eight million, three hundred eighty-eight thousand, seven hundred forty".