158685385 has 4 divisors (see below), whose sum is σ = 190422468. Its totient is φ = 126948304.

The previous prime is 158685383. The next prime is 158685391. The reversal of 158685385 is 583586851.

It is a happy number.

158685385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583586851 = 14437 ⋅40423.

It can be written as a sum of positive squares in 2 ways, for example, as 50296464 + 108388921 = 7092^2 + 10411^2 .

It is a cyclic number.

It is not a de Polignac number, because 158685385 - 2¹ = 158685383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158685383) 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, 15868534 + ... + 15868543.

It is an arithmetic number, because the mean of its divisors is an integer number (47605617).

Almost surely, 2^158685385 is an apocalyptic number.

It is an amenable number.

158685385 is a deficient number, since it is larger than the sum of its proper divisors (31737083).

158685385 is an equidigital number, since it uses as much as digits as its factorization.

158685385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31737082.

The product of its digits is 1152000, while the sum is 49.

The square root of 158685385 is about 12597.0387393228. The cubic root of 158685385 is about 541.3925932868.

The spelling of 158685385 in words is "one hundred fifty-eight million, six hundred eighty-five thousand, three hundred eighty-five".