18670429 has 4 divisors (see below), whose sum is σ = 18687420. Its totient is φ = 18653440.

The previous prime is 18670427. The next prime is 18670439. The reversal of 18670429 is 92407681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8398404 + 10272025 = 2898^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 18670429 - 2¹ = 18670427 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18670423) 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, 6724 + ... + 9085.

It is an arithmetic number, because the mean of its divisors is an integer number (4671855).

Almost surely, 2^18670429 is an apocalyptic number.

It is an amenable number.

18670429 is a deficient number, since it is larger than the sum of its proper divisors (16991).

18670429 is a wasteful number, since it uses less digits than its factorization.

18670429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16990.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 18670429 is about 4320.9291824792. The cubic root of 18670429 is about 265.2883014001.

The spelling of 18670429 in words is "eighteen million, six hundred seventy thousand, four hundred twenty-nine".