40868749 has 2 divisors, whose sum is σ = 40868750. Its totient is φ = 40868748.

The previous prime is 40868747. The next prime is 40868783. The reversal of 40868749 is 94786804.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38663524 + 2205225 = 6218^2 + 1485^2 .

It is a cyclic number.

It is not a de Polignac number, because 40868749 - 2¹ = 40868747 is a prime.

Together with 40868747, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40868699 and 40868708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40868747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20434374 + 20434375.

It is an arithmetic number, because the mean of its divisors is an integer number (20434375).

Almost surely, 2^40868749 is an apocalyptic number.

It is an amenable number.

40868749 is a deficient number, since it is larger than the sum of its proper divisors (1).

40868749 is an equidigital number, since it uses as much as digits as its factorization.

40868749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 40868749 is about 6392.8670406947. The cubic root of 40868749 is about 344.4533778891.

The spelling of 40868749 in words is "forty million, eight hundred sixty-eight thousand, seven hundred forty-nine".