169681420 has 24 divisors (see below), whose sum is σ = 377292384. Its totient is φ = 63879936.

The previous prime is 169681399. The next prime is 169681427. The reversal of 169681420 is 24186961.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 169681420.

It is not an unprimeable number, because it can be changed into a prime (169681427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249192 + ... + 249871.

It is an arithmetic number, because the mean of its divisors is an integer number (15720516).

Almost surely, 2^169681420 is an apocalyptic number.

169681420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169681420 is an abundant number, since it is smaller than the sum of its proper divisors (207610964).

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

169681420 is a wasteful number, since it uses less digits than its factorization.

169681420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499089 (or 499087 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 169681420 is about 13026.1820960710. The cubic root of 169681420 is about 553.6195653022.

The spelling of 169681420 in words is "one hundred sixty-nine million, six hundred eighty-one thousand, four hundred twenty".