158307997 has 4 divisors (see below), whose sum is σ = 158345820. Its totient is φ = 158270176.

The previous prime is 158307991. The next prime is 158308001. The reversal of 158307997 is 799703851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51681721 + 106626276 = 7189^2 + 10326^2 .

It is a cyclic number.

It is not a de Polignac number, because 158307997 - 2⁷ = 158307869 is a prime.

It is a super-2 number, since 2×158307997² = 50122843828304018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158307997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158307991) 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 3 ways as a sum of consecutive naturals, for example, 11722 + ... + 21307.

It is an arithmetic number, because the mean of its divisors is an integer number (39586455).

Almost surely, 2^158307997 is an apocalyptic number.

It is an amenable number.

158307997 is a deficient number, since it is larger than the sum of its proper divisors (37823).

158307997 is an equidigital number, since it uses as much as digits as its factorization.

158307997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37822.

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 158307997 is about 12582.0505880401. The cubic root of 158307997 is about 540.9630699027.

The spelling of 158307997 in words is "one hundred fifty-eight million, three hundred seven thousand, nine hundred ninety-seven".