169997540 has 12 divisors (see below), whose sum is σ = 356994876. Its totient is φ = 67999008.

The previous prime is 169997537. The next prime is 169997557. The reversal of 169997540 is 45799961.

It can be written as a sum of positive squares in 2 ways, for example, as 17623204 + 152374336 = 4198^2 + 12344^2 .

It is a super-3 number, since 3×169997540³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4249919 + ... + 4249958.

It is an arithmetic number, because the mean of its divisors is an integer number (29749573).

Almost surely, 2^169997540 is an apocalyptic number.

169997540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169997540 is an abundant number, since it is smaller than the sum of its proper divisors (186997336).

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

169997540 is a wasteful number, since it uses less digits than its factorization.

169997540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8499886 (or 8499884 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 169997540 is about 13038.3104733704. The cubic root of 169997540 is about 553.9631535921.

The spelling of 169997540 in words is "one hundred sixty-nine million, nine hundred ninety-seven thousand, five hundred forty".