18619429 has 2 divisors, whose sum is σ = 18619430. Its totient is φ = 18619428.

The previous prime is 18619427. The next prime is 18619477. The reversal of 18619429 is 92491681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18507204 + 112225 = 4302^2 + 335^2 .

It is an emirp because it is prime and its reverse (92491681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18619429 - 2¹ = 18619427 is a prime.

Together with 18619427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18619391 and 18619400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18619427) 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, 9309714 + 9309715.

It is an arithmetic number, because the mean of its divisors is an integer number (9309715).

Almost surely, 2^18619429 is an apocalyptic number.

It is an amenable number.

18619429 is a deficient number, since it is larger than the sum of its proper divisors (1).

18619429 is an equidigital number, since it uses as much as digits as its factorization.

18619429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 18619429 is about 4315.0236384057. The cubic root of 18619429 is about 265.0465279641.

The spelling of 18619429 in words is "eighteen million, six hundred nineteen thousand, four hundred twenty-nine".