169890012 has 18 divisors (see below), whose sum is σ = 429444288. Its totient is φ = 56629992.

The previous prime is 169889989. The next prime is 169890031. The reversal of 169890012 is 210098961.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4719167 = 169890012 / (1 + 6 + 9 + 8 + 9 + 0 + 0 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2359548 + ... + 2359619.

It is an arithmetic number, because the mean of its divisors is an integer number (23858016).

Almost surely, 2^169890012 is an apocalyptic number.

169890012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

169890012 is an abundant number, since it is smaller than the sum of its proper divisors (259554276).

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

169890012 is a wasteful number, since it uses less digits than its factorization.

169890012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4719177 (or 4719172 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 169890012 is about 13034.1862807005. The cubic root of 169890012 is about 553.8463301103.

The spelling of 169890012 in words is "one hundred sixty-nine million, eight hundred ninety thousand, twelve".