169409790 has 96 divisors (see below), whose sum is σ = 483380352. Its totient is φ = 40824000.

The previous prime is 169409771. The next prime is 169409797. The reversal of 169409790 is 97904961.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169409797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208485 + ... + 209295.

It is an arithmetic number, because the mean of its divisors is an integer number (5035212).

Almost surely, 2^169409790 is an apocalyptic number.

169409790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 169409790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241690176).

169409790 is an abundant number, since it is smaller than the sum of its proper divisors (313970562).

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

169409790 is a wasteful number, since it uses less digits than its factorization.

169409790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 169409790 is about 13015.7516110288. The cubic root of 169409790 is about 553.3239917940.

The spelling of 169409790 in words is "one hundred sixty-nine million, four hundred nine thousand, seven hundred ninety".