40071749 has 2 divisors, whose sum is σ = 40071750. Its totient is φ = 40071748.

The previous prime is 40071701. The next prime is 40071751. The reversal of 40071749 is 94717004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22372900 + 17698849 = 4730^2 + 4207^2 .

It is a cyclic number.

It is not a de Polignac number, because 40071749 - 2²⁴ = 23294533 is a prime.

It is a Sophie Germain prime.

Together with 40071751, it forms a pair of twin primes.

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 (40071769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20035874 + 20035875.

It is an arithmetic number, because the mean of its divisors is an integer number (20035875).

Almost surely, 2^40071749 is an apocalyptic number.

It is an amenable number.

40071749 is a deficient number, since it is larger than the sum of its proper divisors (1).

40071749 is an equidigital number, since it uses as much as digits as its factorization.

40071749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 40071749 is about 6330.2250354944. The cubic root of 40071749 is about 342.1995489693.

The spelling of 40071749 in words is "forty million, seventy-one thousand, seven hundred forty-nine".