40219649 has 2 divisors, whose sum is σ = 40219650. Its totient is φ = 40219648.

The previous prime is 40219643. The next prime is 40219657. The reversal of 40219649 is 94691204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37761025 + 2458624 = 6145^2 + 1568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40219649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40219643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20109824 + 20109825.

It is an arithmetic number, because the mean of its divisors is an integer number (20109825).

Almost surely, 2^40219649 is an apocalyptic number.

It is an amenable number.

40219649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40219649 is an equidigital number, since it uses as much as digits as its factorization.

40219649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 40219649 is about 6341.8963252327. The cubic root of 40219649 is about 342.6200378438.

The spelling of 40219649 in words is "forty million, two hundred nineteen thousand, six hundred forty-nine".