168439740 has 192 divisors, whose sum is σ = 589897728. Its totient is φ = 35020800.

The previous prime is 168439703. The next prime is 168439753. The reversal of 168439740 is 47934861.

168439740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×168439740² = 56743892022535200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 168439692 and 168439701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 220960 + ... + 221720.

It is an arithmetic number, because the mean of its divisors is an integer number (3072384).

Almost surely, 2^168439740 is an apocalyptic number.

168439740 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 168439740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294948864).

168439740 is an abundant number, since it is smaller than the sum of its proper divisors (421457988).

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

168439740 is a wasteful number, since it uses less digits than its factorization.

168439740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 168439740 is about 12978.4336497129. The cubic root of 168439740 is about 552.2658481051.

The spelling of 168439740 in words is "one hundred sixty-eight million, four hundred thirty-nine thousand, seven hundred forty".