165291420 has 48 divisors (see below), whose sum is σ = 528933888. Its totient is φ = 37780800.

The previous prime is 165291407. The next prime is 165291437. The reversal of 165291420 is 24192561.

165291420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196356 + ... + 197195.

It is an arithmetic number, because the mean of its divisors is an integer number (11019456).

Almost surely, 2^165291420 is an apocalyptic number.

165291420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165291420 is an abundant number, since it is smaller than the sum of its proper divisors (363642468).

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

165291420 is a wasteful number, since it uses less digits than its factorization.

165291420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393570 (or 393568 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 165291420 is about 12856.5710825243. The cubic root of 165291420 is about 548.8033708466.

The spelling of 165291420 in words is "one hundred sixty-five million, two hundred ninety-one thousand, four hundred twenty".