43640953 has 2 divisors, whose sum is σ = 43640954. Its totient is φ = 43640952.

The previous prime is 43640951. The next prime is 43640983. The reversal of 43640953 is 35904634.

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., 42614784 + 1026169 = 6528^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 43640953 - 2¹ = 43640951 is a prime.

Together with 43640951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43640951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21820476 + 21820477.

It is an arithmetic number, because the mean of its divisors is an integer number (21820477).

Almost surely, 2^43640953 is an apocalyptic number.

It is an amenable number.

43640953 is a deficient number, since it is larger than the sum of its proper divisors (1).

43640953 is an equidigital number, since it uses as much as digits as its factorization.

43640953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 43640953 is about 6606.1299563360. The cubic root of 43640953 is about 352.0719361630.

The spelling of 43640953 in words is "forty-three million, six hundred forty thousand, nine hundred fifty-three".