158397391 has 16 divisors (see below), whose sum is σ = 169646400. Its totient is φ = 147616000.

The previous prime is 158397377. The next prime is 158397397. The reversal of 158397391 is 193793851.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 158397391 - 2¹⁷ = 158266319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158397397) 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 15 ways as a sum of consecutive naturals, for example, 119430 + ... + 120748.

It is an arithmetic number, because the mean of its divisors is an integer number (10602900).

Almost surely, 2^158397391 is an apocalyptic number.

158397391 is a deficient number, since it is larger than the sum of its proper divisors (11249009).

158397391 is a wasteful number, since it uses less digits than its factorization.

158397391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490.

The product of its digits is 204120, while the sum is 46.

The square root of 158397391 is about 12585.6025282860. The cubic root of 158397391 is about 541.0648751472.

The spelling of 158397391 in words is "one hundred fifty-eight million, three hundred ninety-seven thousand, three hundred ninety-one".