158381775 has 72 divisors (see below), whose sum is σ = 307105344. Its totient is φ = 77721600.

The previous prime is 158381747. The next prime is 158381779. The reversal of 158381775 is 577183851.

It is not a de Polignac number, because 158381775 - 2¹² = 158377679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 158381775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158381779) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 179335 + ... + 180215.

It is an arithmetic number, because the mean of its divisors is an integer number (4265352).

Almost surely, 2^158381775 is an apocalyptic number.

158381775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

158381775 is a deficient number, since it is larger than the sum of its proper divisors (148723569).

158381775 is a wasteful number, since it uses less digits than its factorization.

158381775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 953 counting only the distinct ones).

The product of its digits is 235200, while the sum is 45.

The square root of 158381775 is about 12584.9821215606. The cubic root of 158381775 is about 541.0470938216.

The spelling of 158381775 in words is "one hundred fifty-eight million, three hundred eighty-one thousand, seven hundred seventy-five".