1155421044 has 24 divisors (see below), whose sum is σ = 2995536320. Its totient is φ = 385140312.

The previous prime is 1155421039. The next prime is 1155421049. The reversal of 1155421044 is 4401245511.

1155421044 is a `hidden beast` number, since 1 + 1 + 554 + 2 + 104 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1155421039) and next prime (1155421049).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1155420999 and 1155421017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155421049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5349064 + ... + 5349279.

Almost surely, 2^1155421044 is an apocalyptic number.

It is an amenable number.

1155421044 is an abundant number, since it is smaller than the sum of its proper divisors (1840115276).

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

1155421044 is a wasteful number, since it uses less digits than its factorization.

1155421044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10698356 (or 10698348 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 1155421044 is about 33991.4848748918. The cubic root of 1155421044 is about 1049.3332256520. Note that the first 3 decimals are identical.

Adding to 1155421044 its reverse (4401245511), we get a palindrome (5556666555).

The spelling of 1155421044 in words is "one billion, one hundred fifty-five million, four hundred twenty-one thousand, forty-four".