158396865 has 48 divisors (see below), whose sum is σ = 280615104. Its totient is φ = 76236160.

The previous prime is 158396851. The next prime is 158396867. The reversal of 158396865 is 568693851.

It is not a de Polignac number, because 158396865 - 2⁶ = 158396801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158396867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 357334 + ... + 357776.

It is an arithmetic number, because the mean of its divisors is an integer number (5846148).

Almost surely, 2^158396865 is an apocalyptic number.

158396865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

158396865 is a deficient number, since it is larger than the sum of its proper divisors (122218239).

158396865 is a wasteful number, since it uses less digits than its factorization.

158396865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 659 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 51.

The square root of 158396865 is about 12585.5816313748. The cubic root of 158396865 is about 541.0642762307.

The spelling of 158396865 in words is "one hundred fifty-eight million, three hundred ninety-six thousand, eight hundred sixty-five".