157818 has 16 divisors (see below), whose sum is σ = 326880. Its totient is φ = 50736.

The previous prime is 157813. The next prime is 157823. The reversal of 157818 is 818751.

157818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (157813) and next prime (157823).

It is a super-2 number, since 2×157818² = 49813042248, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 13.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (157813) by changing a digit.

157818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280 + ... + 627.

It is an arithmetic number, because the mean of its divisors is an integer number (20430).

2¹⁵⁷⁸¹⁸ is an apocalyptic number.

157818 is an abundant number, since it is smaller than the sum of its proper divisors (169062).

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

157818 is a wasteful number, since it uses less digits than its factorization.

157818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941.

The product of its digits is 2240, while the sum is 30.

The square root of 157818 is about 397.2631369760. The cubic root of 157818 is about 54.0404361055.

It can be divided in two parts, 1578 and 18, that added together give a triangular number (1596 = T₅₆).

The spelling of 157818 in words is "one hundred fifty-seven thousand, eight hundred eighteen".