1321839144 has 24 divisors (see below), whose sum is σ = 3579981210. Its totient is φ = 440613024.

The previous prime is 1321839109. The next prime is 1321839149. The reversal of 1321839144 is 4419381231.

1321839144 is a `hidden beast` number, since 13 + 218 + 391 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1238336100 + 83503044 = 35190^2 + 9138^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1321839144² = 3494517445221305472, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1321839099 and 1321839108.

It is not an unprimeable number, because it can be changed into a prime (1321839149) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9179367 + ... + 9179510.

Almost surely, 2^1321839144 is an apocalyptic number.

It is an amenable number.

1321839144 is an abundant number, since it is smaller than the sum of its proper divisors (2258142066).

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

1321839144 is a wasteful number, since it uses less digits than its factorization.

1321839144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18358889 (or 18358882 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1321839144 is about 36357.1058254092. The cubic root of 1321839144 is about 1097.4705361337.

The spelling of 1321839144 in words is "one billion, three hundred twenty-one million, eight hundred thirty-nine thousand, one hundred forty-four".