169945938 has 56 divisors (see below), whose sum is σ = 384626700. Its totient is φ = 56290464.

The previous prime is 169945913. The next prime is 169945967. The reversal of 169945938 is 839549961.

It can be written as a sum of positive squares in 2 ways, for example, as 140493609 + 29452329 = 11853^2 + 5427^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 333628 + ... + 334136.

Almost surely, 2^169945938 is an apocalyptic number.

169945938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 169945938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192313350).

169945938 is an abundant number, since it is smaller than the sum of its proper divisors (214680762).

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

169945938 is an equidigital number, since it uses as much as digits as its factorization.

169945938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758 (or 743 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 169945938 is about 13036.3314624936. The cubic root of 169945938 is about 553.9070968996.

The spelling of 169945938 in words is "one hundred sixty-nine million, nine hundred forty-five thousand, nine hundred thirty-eight".