40938649 has 4 divisors (see below), whose sum is σ = 41004160. Its totient is φ = 40873140.

The previous prime is 40938647. The next prime is 40938683. The reversal of 40938649 is 94683904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40938649 - 2¹ = 40938647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40938647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31809 + ... + 33070.

It is an arithmetic number, because the mean of its divisors is an integer number (10251040).

Almost surely, 2^40938649 is an apocalyptic number.

It is an amenable number.

40938649 is a deficient number, since it is larger than the sum of its proper divisors (65511).

40938649 is an equidigital number, since it uses as much as digits as its factorization.

40938649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65510.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 40938649 is about 6398.3317356949. The cubic root of 40938649 is about 344.6496450275.

The spelling of 40938649 in words is "forty million, nine hundred thirty-eight thousand, six hundred forty-nine".