169906420 has 12 divisors (see below), whose sum is σ = 356803524. Its totient is φ = 67962560.

The previous prime is 169906409. The next prime is 169906421. The reversal of 169906420 is 24609961.

It can be written as a sum of positive squares in 2 ways, for example, as 84750436 + 85155984 = 9206^2 + 9228^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 169906420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169906421) 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, 4247641 + ... + 4247680.

It is an arithmetic number, because the mean of its divisors is an integer number (29733627).

Almost surely, 2^169906420 is an apocalyptic number.

169906420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169906420 is an abundant number, since it is smaller than the sum of its proper divisors (186897104).

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

169906420 is a wasteful number, since it uses less digits than its factorization.

169906420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8495330 (or 8495328 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 169906420 is about 13034.8156872278. The cubic root of 169906420 is about 553.8641597205.

The spelling of 169906420 in words is "one hundred sixty-nine million, nine hundred six thousand, four hundred twenty".