155971800 has 144 divisors (see below), whose sum is σ = 531428040. Its totient is φ = 40988160.

The previous prime is 155971789. The next prime is 155971801. The reversal of 155971800 is 8179551.

155971800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155971801) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 130807 + ... + 131993.

Almost surely, 2^155971800 is an apocalyptic number.

155971800 is a gapful number since it is divisible by the number (10) 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 155971800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265714020).

155971800 is an abundant number, since it is smaller than the sum of its proper divisors (375456240).

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

155971800 is a wasteful number, since it uses less digits than its factorization.

155971800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1270 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 155971800 is about 12488.8670422901. The cubic root of 155971800 is about 538.2888219472.

The spelling of 155971800 in words is "one hundred fifty-five million, nine hundred seventy-one thousand, eight hundred".