165942437 has 4 divisors (see below), whose sum is σ = 171664620. Its totient is φ = 160220256.

The previous prime is 165942419. The next prime is 165942463. The reversal of 165942437 is 734249561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122567041 + 43375396 = 11071^2 + 6586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165942437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165942394 and 165942403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165942037) 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, 2861048 + ... + 2861105.

It is an arithmetic number, because the mean of its divisors is an integer number (42916155).

Almost surely, 2^165942437 is an apocalyptic number.

It is an amenable number.

165942437 is a deficient number, since it is larger than the sum of its proper divisors (5722183).

165942437 is an equidigital number, since it uses as much as digits as its factorization.

165942437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722182.

The product of its digits is 181440, while the sum is 41.

The square root of 165942437 is about 12881.8646553983. The cubic root of 165942437 is about 549.5229328706.

The spelling of 165942437 in words is "one hundred sixty-five million, nine hundred forty-two thousand, four hundred thirty-seven".