169189640 has 16 divisors (see below), whose sum is σ = 380676780. Its totient is φ = 67675840.

The previous prime is 169189619. The next prime is 169189651. The reversal of 169189640 is 46981961.

It can be written as a sum of positive squares in 2 ways, for example, as 144528484 + 24661156 = 12022^2 + 4966^2 .

It is a junction number, because it is equal to n+sod(n) for n = 169189591 and 169189600.

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, 2114831 + ... + 2114910.

Almost surely, 2^169189640 is an apocalyptic number.

169189640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169189640 is an abundant number, since it is smaller than the sum of its proper divisors (211487140).

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

169189640 is a wasteful number, since it uses less digits than its factorization.

169189640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229752 (or 4229748 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 169189640 is about 13007.2918011399. The cubic root of 169189640 is about 553.0842042326.

The spelling of 169189640 in words is "one hundred sixty-nine million, one hundred eighty-nine thousand, six hundred forty".