18949471 has 2 divisors, whose sum is σ = 18949472. Its totient is φ = 18949470.

The previous prime is 18949457. The next prime is 18949487. The reversal of 18949471 is 17494981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18949471 - 2⁹ = 18948959 is a prime.

It is a super-3 number, since 3×18949471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18949571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474735 + 9474736.

It is an arithmetic number, because the mean of its divisors is an integer number (9474736).

Almost surely, 2^18949471 is an apocalyptic number.

18949471 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949471 is an equidigital number, since it uses as much as digits as its factorization.

18949471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 18949471 is about 4353.0990110495. The cubic root of 18949471 is about 266.6034080853.

The spelling of 18949471 in words is "eighteen million, nine hundred forty-nine thousand, four hundred seventy-one".