18472849 has 2 divisors, whose sum is σ = 18472850. Its totient is φ = 18472848.

The previous prime is 18472823. The next prime is 18472859. The reversal of 18472849 is 94827481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 154449 = 4280^2 + 393^2 .

It is a cyclic number.

It is not a de Polignac number, because 18472849 - 2¹¹ = 18470801 is a prime.

It is not a weakly prime, because it can be changed into another prime (18472859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9236424 + 9236425.

It is an arithmetic number, because the mean of its divisors is an integer number (9236425).

Almost surely, 2^18472849 is an apocalyptic number.

It is an amenable number.

18472849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18472849 is an equidigital number, since it uses as much as digits as its factorization.

18472849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 18472849 is about 4298.0052349898. The cubic root of 18472849 is about 264.3491754382.

It can be divided in two parts, 18472 and 849, that added together give a square (19321 = 139²).

The spelling of 18472849 in words is "eighteen million, four hundred seventy-two thousand, eight hundred forty-nine".