158209840 has 20 divisors (see below), whose sum is σ = 367838064. Its totient is φ = 63283904.

The previous prime is 158209829. The next prime is 158209841. The reversal of 158209840 is 48902851.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 158209840.

It is not an unprimeable number, because it can be changed into a prime (158209841) 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 3 ways as a sum of consecutive naturals, for example, 988732 + ... + 988891.

Almost surely, 2^158209840 is an apocalyptic number.

158209840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158209840 is an abundant number, since it is smaller than the sum of its proper divisors (209628224).

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

158209840 is a wasteful number, since it uses less digits than its factorization.

158209840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977636 (or 1977630 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 158209840 is about 12578.1493074299. The cubic root of 158209840 is about 540.8512408703.

The spelling of 158209840 in words is "one hundred fifty-eight million, two hundred nine thousand, eight hundred forty".