158723738 has 4 divisors (see below), whose sum is σ = 238085610. Its totient is φ = 79361868.

The previous prime is 158723717. The next prime is 158723743. The reversal of 158723738 is 837327851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 837327851 = 5167 ⋅162053.

It can be written as a sum of positive squares in only one way, i.e., 98148649 + 60575089 = 9907^2 + 7783^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39680933 + ... + 39680936.

Almost surely, 2^158723738 is an apocalyptic number.

158723738 is a deficient number, since it is larger than the sum of its proper divisors (79361872).

158723738 is an equidigital number, since it uses as much as digits as its factorization.

158723738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79361871.

The product of its digits is 282240, while the sum is 44.

The square root of 158723738 is about 12598.5609495688. The cubic root of 158723738 is about 541.4362065398.

The spelling of 158723738 in words is "one hundred fifty-eight million, seven hundred twenty-three thousand, seven hundred thirty-eight".