158396689 has 4 divisors (see below), whose sum is σ = 172796400. Its totient is φ = 143996980.

The previous prime is 158396681. The next prime is 158396713. The reversal of 158396689 is 986693851.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 158396689 - 2³ = 158396681 is a prime.

It is a super-2 number, since 2×158396689² = 50179022172325442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158396681) 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, 7199839 + ... + 7199860.

It is an arithmetic number, because the mean of its divisors is an integer number (43199100).

Almost surely, 2^158396689 is an apocalyptic number.

It is an amenable number.

158396689 is a deficient number, since it is larger than the sum of its proper divisors (14399711).

158396689 is a wasteful number, since it uses less digits than its factorization.

158396689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14399710.

The product of its digits is 2799360, while the sum is 55.

The square root of 158396689 is about 12585.5746392447. The cubic root of 158396689 is about 541.0640758325.

The spelling of 158396689 in words is "one hundred fifty-eight million, three hundred ninety-six thousand, six hundred eighty-nine".