40003749 has 6 divisors (see below), whose sum is σ = 57783206. Its totient is φ = 26669160.

The previous prime is 40003723. The next prime is 40003753. The reversal of 40003749 is 94730004.

It can be written as a sum of positive squares in only one way, i.e., 39463524 + 540225 = 6282^2 + 735^2 .

It is not a de Polignac number, because 40003749 - 2¹⁵ = 39970981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40003709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2222422 + ... + 2222439.

Almost surely, 2^40003749 is an apocalyptic number.

It is an amenable number.

40003749 is a deficient number, since it is larger than the sum of its proper divisors (17779457).

40003749 is a wasteful number, since it uses less digits than its factorization.

40003749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444867 (or 4444864 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 40003749 is about 6324.8516978661. The cubic root of 40003749 is about 342.0058735013.

The spelling of 40003749 in words is "forty million, three thousand, seven hundred forty-nine".