155403243 has 12 divisors (see below), whose sum is σ = 229946808. Its totient is φ = 101075040.

The previous prime is 155403233. The next prime is 155403263. The reversal of 155403243 is 342304551.

155403243 is a `hidden beast` number, since 15 + 5 + 403 + 243 = 666.

155403243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155403243 - 2⁶ = 155403179 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (155403233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210205 + ... + 210942.

It is an arithmetic number, because the mean of its divisors is an integer number (19162234).

Almost surely, 2^155403243 is an apocalyptic number.

155403243 is a deficient number, since it is larger than the sum of its proper divisors (74543565).

155403243 is a wasteful number, since it uses less digits than its factorization.

155403243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421194 (or 421191 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 155403243 is about 12466.0837074039. The cubic root of 155403243 is about 537.6339588953.

Adding to 155403243 its reverse (342304551), we get a palindrome (497707794).

The spelling of 155403243 in words is "one hundred fifty-five million, four hundred three thousand, two hundred forty-three".