158815399 has 4 divisors (see below), whose sum is σ = 159050664. Its totient is φ = 158580136.

The previous prime is 158815381. The next prime is 158815403. The reversal of 158815399 is 993518851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993518851 = 13 ⋅76424527.

It is a cyclic number.

It is not a de Polignac number, because 158815399 - 2¹⁷ = 158684327 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158815379) 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, 116617 + ... + 117970.

It is an arithmetic number, because the mean of its divisors is an integer number (39762666).

Almost surely, 2^158815399 is an apocalyptic number.

158815399 is a deficient number, since it is larger than the sum of its proper divisors (235265).

158815399 is an equidigital number, since it uses as much as digits as its factorization.

158815399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235264.

The product of its digits is 388800, while the sum is 49.

The square root of 158815399 is about 12602.1981812698. The cubic root of 158815399 is about 541.5404107261.

The spelling of 158815399 in words is "one hundred fifty-eight million, eight hundred fifteen thousand, three hundred ninety-nine".