158109390 has 48 divisors (see below), whose sum is σ = 415724400. Its totient is φ = 41686656.

The previous prime is 158109389. The next prime is 158109397. The reversal of 158109390 is 93901851.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158109397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1860 + ... + 17879.

It is an arithmetic number, because the mean of its divisors is an integer number (8660925).

Almost surely, 2^158109390 is an apocalyptic number.

158109390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 158109390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207862200).

158109390 is an abundant number, since it is smaller than the sum of its proper divisors (257615010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

158109390 is a wasteful number, since it uses less digits than its factorization.

158109390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19841 (or 19838 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 158109390 is about 12574.1556376562. The cubic root of 158109390 is about 540.7367515540.

It can be divided in two parts, 15810 and 9390, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 158109390 in words is "one hundred fifty-eight million, one hundred nine thousand, three hundred ninety".