18628429 has 2 divisors, whose sum is σ = 18628430. Its totient is φ = 18628428.

The previous prime is 18628409. The next prime is 18628433. The reversal of 18628429 is 92482681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 1695204 = 4115^2 + 1302^2 .

It is an emirp because it is prime and its reverse (92482681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18628429 - 2⁵ = 18628397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18628391 and 18628400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18628409) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9314214 + 9314215.

It is an arithmetic number, because the mean of its divisors is an integer number (9314215).

Almost surely, 2^18628429 is an apocalyptic number.

It is an amenable number.

18628429 is a deficient number, since it is larger than the sum of its proper divisors (1).

18628429 is an equidigital number, since it uses as much as digits as its factorization.

18628429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 18628429 is about 4316.0663803978. The cubic root of 18628429 is about 265.0892259171.

The spelling of 18628429 in words is "eighteen million, six hundred twenty-eight thousand, four hundred twenty-nine".