158515812 has 144 divisors (see below), whose sum is σ = 509819520. Its totient is φ = 41477184.

The previous prime is 158515789. The next prime is 158515817. The reversal of 158515812 is 218515851.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (158515817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1248093 + ... + 1248219.

Almost surely, 2^158515812 is an apocalyptic number.

158515812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158515812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254909760).

158515812 is an abundant number, since it is smaller than the sum of its proper divisors (351303708).

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

158515812 is a wasteful number, since it uses less digits than its factorization.

158515812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 152 counting only the distinct ones).

The product of its digits is 16000, while the sum is 36.

The square root of 158515812 is about 12590.3062710960. The cubic root of 158515812 is about 541.1996784675.

The spelling of 158515812 in words is "one hundred fifty-eight million, five hundred fifteen thousand, eight hundred twelve".