18071429 has 4 divisors (see below), whose sum is σ = 18559884. Its totient is φ = 17582976.

The previous prime is 18071411. The next prime is 18071461. The reversal of 18071429 is 92417081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92417081 = 3463 ⋅26687.

It can be written as a sum of positive squares in 2 ways, for example, as 13653025 + 4418404 = 3695^2 + 2102^2 .

It is a cyclic number.

It is not a de Polignac number, because 18071429 - 2²⁰ = 17022853 is a prime.

It is a super-2 number, since 2×18071429² = 653153092204082, 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 = 18071395 and 18071404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071479) 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, 244172 + ... + 244245.

It is an arithmetic number, because the mean of its divisors is an integer number (4639971).

Almost surely, 2^18071429 is an apocalyptic number.

It is an amenable number.

18071429 is a deficient number, since it is larger than the sum of its proper divisors (488455).

18071429 is an equidigital number, since it uses as much as digits as its factorization.

18071429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488454.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18071429 is about 4251.0503407981. The cubic root of 18071429 is about 262.4203428746.

The spelling of 18071429 in words is "eighteen million, seventy-one thousand, four hundred twenty-nine".