165943420 has 12 divisors (see below), whose sum is σ = 348481224. Its totient is φ = 66377360.

The previous prime is 165943399. The next prime is 165943439. The reversal of 165943420 is 24349561.

It is a happy number.

165943420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4148566 + ... + 4148605.

It is an arithmetic number, because the mean of its divisors is an integer number (29040102).

Almost surely, 2^165943420 is an apocalyptic number.

165943420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165943420 is an abundant number, since it is smaller than the sum of its proper divisors (182537804).

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

165943420 is a wasteful number, since it uses less digits than its factorization.

165943420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8297180 (or 8297178 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 165943420 is about 12881.9028097560. The cubic root of 165943420 is about 549.5240179456.

The spelling of 165943420 in words is "one hundred sixty-five million, nine hundred forty-three thousand, four hundred twenty".