18041929 has 4 divisors (see below), whose sum is σ = 18060820. Its totient is φ = 18023040.

The previous prime is 18041921. The next prime is 18041939. The reversal of 18041929 is 92914081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92914081 = 13 ⋅7147237.

It can be written as a sum of positive squares in 2 ways, for example, as 6125625 + 11916304 = 2475^2 + 3452^2 .

It is a cyclic number.

It is not a de Polignac number, because 18041929 - 2³ = 18041921 is a prime.

It is a super-2 number, since 2×18041929² = 651022404082082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18041894 and 18041903.

It is not an unprimeable number, because it can be changed into a prime (18041921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7932 + ... + 9949.

It is an arithmetic number, because the mean of its divisors is an integer number (4515205).

Almost surely, 2^18041929 is an apocalyptic number.

It is an amenable number.

18041929 is a deficient number, since it is larger than the sum of its proper divisors (18891).

18041929 is a wasteful number, since it uses less digits than its factorization.

18041929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18890.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18041929 is about 4247.5791929051. The cubic root of 18041929 is about 262.2774724847.

The spelling of 18041929 in words is "eighteen million, forty-one thousand, nine hundred twenty-nine".