169643394 has 24 divisors (see below), whose sum is σ = 367835052. Its totient is φ = 56505600.

The previous prime is 169643317. The next prime is 169643399. The reversal of 169643394 is 493346961.

It can be written as a sum of positive squares in 2 ways, for example, as 168350625 + 1292769 = 12975^2 + 1137^2 .

It is a super-2 number, since 2×169643394² = 57557762255678472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (169643399) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 29802 + ... + 35034.

Almost surely, 2^169643394 is an apocalyptic number.

169643394 is an abundant number, since it is smaller than the sum of its proper divisors (198191658).

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

169643394 is a wasteful number, since it uses less digits than its factorization.

169643394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042 (or 7039 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 169643394 is about 13024.7224154682. The cubic root of 169643394 is about 553.5782064027.

The spelling of 169643394 in words is "one hundred sixty-nine million, six hundred forty-three thousand, three hundred ninety-four".