158438905 has 8 divisors (see below), whose sum is σ = 191338632. Its totient is φ = 125943168.

The previous prime is 158438873. The next prime is 158438909. The reversal of 158438905 is 509834851.

It can be written as a sum of positive squares in 4 ways, for example, as 3286969 + 155151936 = 1813^2 + 12456^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158438905 - 2⁵ = 158438873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158438909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100132 + ... + 101701.

It is an arithmetic number, because the mean of its divisors is an integer number (23917329).

Almost surely, 2^158438905 is an apocalyptic number.

It is an amenable number.

158438905 is a deficient number, since it is larger than the sum of its proper divisors (32899727).

158438905 is a wasteful number, since it uses less digits than its factorization.

158438905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201995.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 158438905 is about 12587.2516857335. The cubic root of 158438905 is about 541.1121398255.

The spelling of 158438905 in words is "one hundred fifty-eight million, four hundred thirty-eight thousand, nine hundred five".