168491538 has 24 divisors (see below), whose sum is σ = 367488576. Its totient is φ = 55791000.

The previous prime is 168491527. The next prime is 168491549. The reversal of 168491538 is 835194861.

It is an interprime number because it is at equal distance from previous prime (168491527) and next prime (168491549).

It is a junction number, because it is equal to n+sod(n) for n = 168491493 and 168491502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28278 + ... + 33713.

It is an arithmetic number, because the mean of its divisors is an integer number (15312024).

Almost surely, 2^168491538 is an apocalyptic number.

168491538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168491538 is an abundant number, since it is smaller than the sum of its proper divisors (198997038).

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

168491538 is a wasteful number, since it uses less digits than its factorization.

168491538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62150 (or 62147 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 168491538 is about 12980.4290375935. The cubic root of 168491538 is about 552.3224525909.

The spelling of 168491538 in words is "one hundred sixty-eight million, four hundred ninety-one thousand, five hundred thirty-eight".