168988390 has 16 divisors (see below), whose sum is σ = 309335760. Its totient is φ = 66449440.

The previous prime is 168988367. The next prime is 168988397. The reversal of 168988390 is 93889861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168988397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142621 + ... + 143800.

It is an arithmetic number, because the mean of its divisors is an integer number (19333485).

Almost surely, 2^168988390 is an apocalyptic number.

168988390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168988390 is a deficient number, since it is larger than the sum of its proper divisors (140347370).

168988390 is a wasteful number, since it uses less digits than its factorization.

168988390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286487.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 168988390 is about 12999.5534538691. The cubic root of 168988390 is about 552.8648205108.

The spelling of 168988390 in words is "one hundred sixty-eight million, nine hundred eighty-eight thousand, three hundred ninety".