18157829 has 2 divisors, whose sum is σ = 18157830. Its totient is φ = 18157828.

The previous prime is 18157823. The next prime is 18157831. The reversal of 18157829 is 92875181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 7300804 = 3295^2 + 2702^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18157829 is a prime.

Together with 18157831, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18157823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9078914 + 9078915.

It is an arithmetic number, because the mean of its divisors is an integer number (9078915).

Almost surely, 2^18157829 is an apocalyptic number.

It is an amenable number.

18157829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18157829 is an equidigital number, since it uses as much as digits as its factorization.

18157829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 18157829 is about 4261.2004177227. The cubic root of 18157829 is about 262.8378911068.

The spelling of 18157829 in words is "eighteen million, one hundred fifty-seven thousand, eight hundred twenty-nine".