169890997 has 8 divisors (see below), whose sum is σ = 171728480. Its totient is φ = 168058800.

The previous prime is 169890971. The next prime is 169891021. The reversal of 169890997 is 799098961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 169890997 - 2¹¹ = 169888949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169890697) 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 7 ways as a sum of consecutive naturals, for example, 113818 + ... + 115300.

It is an arithmetic number, because the mean of its divisors is an integer number (21466060).

Almost surely, 2^169890997 is an apocalyptic number.

It is an amenable number.

169890997 is a deficient number, since it is larger than the sum of its proper divisors (1837483).

169890997 is a wasteful number, since it uses less digits than its factorization.

169890997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The square root of 169890997 is about 13034.2240658967. The cubic root of 169890997 is about 553.8474004844.

The spelling of 169890997 in words is "one hundred sixty-nine million, eight hundred ninety thousand, nine hundred ninety-seven".