18992473 has 2 divisors, whose sum is σ = 18992474. Its totient is φ = 18992472.

The previous prime is 18992461. The next prime is 18992531. The reversal of 18992473 is 37429981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14653584 + 4338889 = 3828^2 + 2083^2 .

It is a cyclic number.

It is not a de Polignac number, because 18992473 - 2¹³ = 18984281 is a prime.

It is not a weakly prime, because it can be changed into another prime (18996473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9496236 + 9496237.

It is an arithmetic number, because the mean of its divisors is an integer number (9496237).

Almost surely, 2^18992473 is an apocalyptic number.

It is an amenable number.

18992473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18992473 is an equidigital number, since it uses as much as digits as its factorization.

18992473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 18992473 is about 4358.0354518980. The cubic root of 18992473 is about 266.8049232721.

The spelling of 18992473 in words is "eighteen million, nine hundred ninety-two thousand, four hundred seventy-three".