155023403 has 4 divisors (see below), whose sum is σ = 155200248. Its totient is φ = 154846560.

The previous prime is 155023399. The next prime is 155023417. The reversal of 155023403 is 304320551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304320551 = 199 ⋅1529249.

It is a cyclic number.

It is not a de Polignac number, because 155023403 - 2² = 155023399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155023483) 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, 87101 + ... + 88862.

It is an arithmetic number, because the mean of its divisors is an integer number (38800062).

Almost surely, 2^155023403 is an apocalyptic number.

155023403 is a deficient number, since it is larger than the sum of its proper divisors (176845).

155023403 is an equidigital number, since it uses as much as digits as its factorization.

155023403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176844.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 155023403 is about 12450.8394496114. The cubic root of 155023403 is about 537.1955693065.

Adding to 155023403 its reverse (304320551), we get a palindrome (459343954).

The spelling of 155023403 in words is "one hundred fifty-five million, twenty-three thousand, four hundred three".