1840401329 has 4 divisors (see below), whose sum is σ = 1981970676. Its totient is φ = 1698831984.

The previous prime is 1840401307. The next prime is 1840401371. The reversal of 1840401329 is 9231040481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9231040481 = 13 ⋅710080037.

It can be written as a sum of positive squares in 2 ways, for example, as 865712929 + 974688400 = 29423^2 + 31220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840401329 - 2²⁴ = 1823624113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1840401295 and 1840401304.

It is not an unprimeable number, because it can be changed into a prime (1840401229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70784654 + ... + 70784679.

It is an arithmetic number, because the mean of its divisors is an integer number (495492669).

Almost surely, 2^1840401329 is an apocalyptic number.

It is an amenable number.

1840401329 is a deficient number, since it is larger than the sum of its proper divisors (141569347).

1840401329 is a wasteful number, since it uses less digits than its factorization.

1840401329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141569346.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1840401329 is about 42899.8989392749. The cubic root of 1840401329 is about 1225.4742196182.

The spelling of 1840401329 in words is "one billion, eight hundred forty million, four hundred one thousand, three hundred twenty-nine".