18029749 has 2 divisors, whose sum is σ = 18029750. Its totient is φ = 18029748.

The previous prime is 18029743. The next prime is 18029777. The reversal of 18029749 is 94792081.

18029749 is nontrivially palindromic in base 7.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 515524 = 4185^2 + 718^2 .

It is a cyclic number.

It is not a de Polignac number, because 18029749 - 2⁷ = 18029621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18029743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9014874 + 9014875.

It is an arithmetic number, because the mean of its divisors is an integer number (9014875).

Almost surely, 2^18029749 is an apocalyptic number.

It is an amenable number.

18029749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18029749 is an equidigital number, since it uses as much as digits as its factorization.

18029749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 18029749 is about 4246.1451929956. The cubic root of 18029749 is about 262.2184385393.

It can be divided in two parts, 180 and 29749, that added together give a square (29929 = 173²).

The spelling of 18029749 in words is "eighteen million, twenty-nine thousand, seven hundred forty-nine".