158240381 has 8 divisors (see below), whose sum is σ = 170510424. Its totient is φ = 145984320.

The previous prime is 158240353. The next prime is 158240389. The reversal of 158240381 is 183042851.

It can be written as a sum of positive squares in 4 ways, for example, as 16273156 + 141967225 = 4034^2 + 11915^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158240381 - 2⁶ = 158240317 is a prime.

It is a super-2 number, since 2×158240381² = 50080036358050322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158240389) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 43235 + ... + 46751.

It is an arithmetic number, because the mean of its divisors is an integer number (21313803).

Almost surely, 2^158240381 is an apocalyptic number.

It is an amenable number.

158240381 is a deficient number, since it is larger than the sum of its proper divisors (12270043).

158240381 is a wasteful number, since it uses less digits than its factorization.

158240381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6991.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 158240381 is about 12579.3632986729. The cubic root of 158240381 is about 540.8860408022.

The spelling of 158240381 in words is "one hundred fifty-eight million, two hundred forty thousand, three hundred eighty-one".