1155543642 has 24 divisors (see below), whose sum is σ = 2731285440. Its totient is φ = 350164680.

The previous prime is 1155543589. The next prime is 1155543643. The reversal of 1155543642 is 2463455511.

1155543642 is a `hidden beast` number, since 1 + 1 + 5 + 5 + 5 + 4 + 3 + 642 = 666.

It is a super-2 number, since 2×1155543642² = 2670562217133248328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1155543597 and 1155543606.

It is not an unprimeable number, because it can be changed into a prime (1155543643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2917842 + ... + 2918237.

It is an arithmetic number, because the mean of its divisors is an integer number (113803560).

Almost surely, 2^1155543642 is an apocalyptic number.

1155543642 is an abundant number, since it is smaller than the sum of its proper divisors (1575741798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155543642 is a wasteful number, since it uses less digits than its factorization.

1155543642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5836098 (or 5836095 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 1155543642 is about 33993.2881904649. The cubic root of 1155543642 is about 1049.3703381274.

The spelling of 1155543642 in words is "one billion, one hundred fifty-five million, five hundred forty-three thousand, six hundred forty-two".