1144169820 has 48 divisors (see below), whose sum is σ = 3559641120. Its totient is φ = 305111808.

The previous prime is 1144169809. The next prime is 1144169827. The reversal of 1144169820 is 289614411.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144169827) 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 15 ways as a sum of consecutive naturals, for example, 1058877 + ... + 1059956.

It is an arithmetic number, because the mean of its divisors is an integer number (74159190).

Almost surely, 2^1144169820 is an apocalyptic number.

1144169820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144169820 is an abundant number, since it is smaller than the sum of its proper divisors (2415471300).

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

1144169820 is a wasteful number, since it uses less digits than its factorization.

1144169820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118851 (or 2118843 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1144169820 is about 33825.5793741955. The cubic root of 1144169820 is about 1045.9160545706.

The spelling of 1144169820 in words is "one billion, one hundred forty-four million, one hundred sixty-nine thousand, eight hundred twenty".