90387749 has 2 divisors, whose sum is σ = 90387750. Its totient is φ = 90387748.

The previous prime is 90387743. The next prime is 90387811. The reversal of 90387749 is 94778309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79530724 + 10857025 = 8918^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 90387749 - 2⁴ = 90387733 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90387743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45193874 + 45193875.

It is an arithmetic number, because the mean of its divisors is an integer number (45193875).

Almost surely, 2^90387749 is an apocalyptic number.

It is an amenable number.

90387749 is a deficient number, since it is larger than the sum of its proper divisors (1).

90387749 is an equidigital number, since it uses as much as digits as its factorization.

90387749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 90387749 is about 9507.2471830704. The cubic root of 90387749 is about 448.7831304699.

The spelling of 90387749 in words is "ninety million, three hundred eighty-seven thousand, seven hundred forty-nine".