155400203 has 8 divisors (see below), whose sum is σ = 177700320. Its totient is φ = 133125120.

The previous prime is 155400181. The next prime is 155400211. The reversal of 155400203 is 302004551.

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 155400203 - 2⁶ = 155400139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155400803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9803 + ... + 20171.

It is an arithmetic number, because the mean of its divisors is an integer number (22212540).

Almost surely, 2^155400203 is an apocalyptic number.

155400203 is a deficient number, since it is larger than the sum of its proper divisors (22300117).

155400203 is a wasteful number, since it uses less digits than its factorization.

155400203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12517.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 155400203 is about 12465.9617759722. The cubic root of 155400203 is about 537.6304531386.

Adding to 155400203 its reverse (302004551), we get a palindrome (457404754).

The spelling of 155400203 in words is "one hundred fifty-five million, four hundred thousand, two hundred three".