165971740 has 24 divisors (see below), whose sum is σ = 380226672. Its totient is φ = 60353280.

The previous prime is 165971723. The next prime is 165971777. The reversal of 165971740 is 47179561.

165971740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 165971693 and 165971702.

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 7 ways as a sum of consecutive naturals, for example, 376989 + ... + 377428.

It is an arithmetic number, because the mean of its divisors is an integer number (15842778).

Almost surely, 2^165971740 is an apocalyptic number.

165971740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165971740 is an abundant number, since it is smaller than the sum of its proper divisors (214254932).

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

165971740 is a wasteful number, since it uses less digits than its factorization.

165971740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754437 (or 754435 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 165971740 is about 12883.0019793525. The cubic root of 165971740 is about 549.5552768630. Note that the first 3 decimals are identical.

The spelling of 165971740 in words is "one hundred sixty-five million, nine hundred seventy-one thousand, seven hundred forty".