168538390 has 8 divisors (see below), whose sum is σ = 303369120. Its totient is φ = 67415352.

The previous prime is 168538387. The next prime is 168538507. The reversal of 168538390 is 93835861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8426910 + ... + 8426929.

It is an arithmetic number, because the mean of its divisors is an integer number (37921140).

Almost surely, 2^168538390 is an apocalyptic number.

168538390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168538390 is a deficient number, since it is larger than the sum of its proper divisors (134830730).

168538390 is a wasteful number, since it uses less digits than its factorization.

168538390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16853846.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 168538390 is about 12982.2336290794. The cubic root of 168538390 is about 552.3736421317.

The spelling of 168538390 in words is "one hundred sixty-eight million, five hundred thirty-eight thousand, three hundred ninety".