155220403 has 8 divisors (see below), whose sum is σ = 167378400. Its totient is φ = 143093568.

The previous prime is 155220397. The next prime is 155220419. The reversal of 155220403 is 304022551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155220403 - 2⁵ = 155220371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155220433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3138 + ... + 17896.

It is an arithmetic number, because the mean of its divisors is an integer number (20922300).

Almost surely, 2^155220403 is an apocalyptic number.

155220403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

155220403 is a deficient number, since it is larger than the sum of its proper divisors (12157997).

155220403 is a wasteful number, since it uses less digits than its factorization.

155220403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15581.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 155220403 is about 12458.7480510684. The cubic root of 155220403 is about 537.4230247079.

Adding to 155220403 its reverse (304022551), we get a palindrome (459242954).

The spelling of 155220403 in words is "one hundred fifty-five million, two hundred twenty thousand, four hundred three".