158817812 has 12 divisors (see below), whose sum is σ = 278144916. Its totient is φ = 79347840.

The previous prime is 158817811. The next prime is 158817821. The reversal of 158817812 is 218718851.

It can be written as a sum of positive squares in 2 ways, for example, as 19483396 + 139334416 = 4414^2 + 11804^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 158817812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158817811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9143 + ... + 20030.

It is an arithmetic number, because the mean of its divisors is an integer number (23178743).

Almost surely, 2^158817812 is an apocalyptic number.

It is an amenable number.

158817812 is a deficient number, since it is larger than the sum of its proper divisors (119327104).

158817812 is a wasteful number, since it uses less digits than its factorization.

158817812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30538 (or 30536 counting only the distinct ones).

The product of its digits is 35840, while the sum is 41.

The square root of 158817812 is about 12602.2939181722. The cubic root of 158817812 is about 541.5431533871.

The spelling of 158817812 in words is "one hundred fifty-eight million, eight hundred seventeen thousand, eight hundred twelve".