1155420203 has 16 divisors (see below), whose sum is σ = 1380158976. Its totient is φ = 945743040.

The previous prime is 1155420199. The next prime is 1155420209. The reversal of 1155420203 is 3020245511.

It is a cyclic number.

It is not a de Polignac number, because 1155420203 - 2² = 1155420199 is a prime.

It is a super-2 number, since 2×1155420203² = 2669991691001122418, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (1155420209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97943 + ... + 109103.

It is an arithmetic number, because the mean of its divisors is an integer number (86259936).

Almost surely, 2^1155420203 is an apocalyptic number.

1155420203 is a deficient number, since it is larger than the sum of its proper divisors (224738773).

1155420203 is a wasteful number, since it uses less digits than its factorization.

1155420203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11834.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1155420203 is about 33991.4725041443. The cubic root of 1155420203 is about 1049.3329710581.

Adding to 1155420203 its reverse (3020245511), we get a palindrome (4175665714).

The spelling of 1155420203 in words is "one billion, one hundred fifty-five million, four hundred twenty thousand, two hundred three".