1155540423 has 12 divisors (see below), whose sum is σ = 1626080568. Its totient is φ = 729814320.

The previous prime is 1155540403. The next prime is 1155540427. The reversal of 1155540423 is 3240455511.

It is not a de Polignac number, because 1155540423 - 2¹⁷ = 1155409351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155540427) 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 11 ways as a sum of consecutive naturals, for example, 532408 + ... + 534573.

It is an arithmetic number, because the mean of its divisors is an integer number (135506714).

Almost surely, 2^1155540423 is an apocalyptic number.

1155540423 is a deficient number, since it is larger than the sum of its proper divisors (470540145).

1155540423 is a wasteful number, since it uses less digits than its factorization.

1155540423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067022 (or 1067003 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1155540423 is about 33993.2408428499. The cubic root of 1155540423 is about 1049.3693637155.

Adding to 1155540423 its reverse (3240455511), we get a palindrome (4395995934).

The spelling of 1155540423 in words is "one billion, one hundred fifty-five million, five hundred forty thousand, four hundred twenty-three".