169940989 has 4 divisors (see below), whose sum is σ = 170890560. Its totient is φ = 168991420.

The previous prime is 169940933. The next prime is 169940999. The reversal of 169940989 is 989049961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989049961 = 619 ⋅1597819.

It is a cyclic number.

It is not a de Polignac number, because 169940989 - 2¹³ = 169932797 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 (169940999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474517 + ... + 474874.

It is an arithmetic number, because the mean of its divisors is an integer number (42722640).

Almost surely, 2^169940989 is an apocalyptic number.

It is an amenable number.

169940989 is a deficient number, since it is larger than the sum of its proper divisors (949571).

169940989 is an equidigital number, since it uses as much as digits as its factorization.

169940989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949570.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 169940989 is about 13036.1416454410. The cubic root of 169940989 is about 553.9017200665.

The spelling of 169940989 in words is "one hundred sixty-nine million, nine hundred forty thousand, nine hundred eighty-nine".