18633401 has 2 divisors, whose sum is σ = 18633402. Its totient is φ = 18633400.

The previous prime is 18633383. The next prime is 18633403. The reversal of 18633401 is 10433681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16605625 + 2027776 = 4075^2 + 1424^2 .

It is a cyclic number.

It is not a de Polignac number, because 18633401 - 2⁶ = 18633337 is a prime.

Together with 18633403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18633403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9316700 + 9316701.

It is an arithmetic number, because the mean of its divisors is an integer number (9316701).

Almost surely, 2^18633401 is an apocalyptic number.

It is an amenable number.

18633401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18633401 is an equidigital number, since it uses as much as digits as its factorization.

18633401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 18633401 is about 4316.6423294037. The cubic root of 18633401 is about 265.1128082669.

The spelling of 18633401 in words is "eighteen million, six hundred thirty-three thousand, four hundred one".