18690047 has 2 divisors, whose sum is σ = 18690048. Its totient is φ = 18690046.

The previous prime is 18690043. The next prime is 18690059. The reversal of 18690047 is 74009681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18690047 - 2² = 18690043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18689989 and 18690016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18690041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9345023 + 9345024.

It is an arithmetic number, because the mean of its divisors is an integer number (9345024).

Almost surely, 2^18690047 is an apocalyptic number.

18690047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18690047 is an equidigital number, since it uses as much as digits as its factorization.

18690047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 18690047 is about 4323.1987000368. The cubic root of 18690047 is about 265.3811863236.

The spelling of 18690047 in words is "eighteen million, six hundred ninety thousand, forty-seven".