158197739 has 12 divisors (see below), whose sum is σ = 184491216. Its totient is φ = 132835872.

The previous prime is 158197687. The next prime is 158197759. The reversal of 158197739 is 937791851.

It is not a de Polignac number, because 158197739 - 2²⁰ = 157149163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158197759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241937 + ... + 242589.

It is an arithmetic number, because the mean of its divisors is an integer number (15374268).

Almost surely, 2^158197739 is an apocalyptic number.

158197739 is a deficient number, since it is larger than the sum of its proper divisors (26293477).

158197739 is an frugal number, since it uses more digits than its factorization.

158197739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366 (or 713 counting only the distinct ones).

The product of its digits is 476280, while the sum is 50.

The square root of 158197739 is about 12577.6682656206. The cubic root of 158197739 is about 540.8374511512.

The spelling of 158197739 in words is "one hundred fifty-eight million, one hundred ninety-seven thousand, seven hundred thirty-nine".