18404629 has 6 divisors (see below), whose sum is σ = 18551330. Its totient is φ = 18259056.

The previous prime is 18404627. The next prime is 18404653. The reversal of 18404629 is 92640481.

It can be written as a sum of positive squares in 3 ways, for example, as 529 + 18404100 = 23^2 + 4290^2 .

It is not a de Polignac number, because 18404629 - 2¹ = 18404627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18404594 and 18404603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21787 + ... + 22615.

Almost surely, 2^18404629 is an apocalyptic number.

It is an amenable number.

18404629 is a deficient number, since it is larger than the sum of its proper divisors (146701).

18404629 is an frugal number, since it uses more digits than its factorization.

18404629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 18404629 is about 4290.0616545686. The cubic root of 18404629 is about 264.0233613012.

The spelling of 18404629 in words is "eighteen million, four hundred four thousand, six hundred twenty-nine".