43864649 has 2 divisors, whose sum is σ = 43864650. Its totient is φ = 43864648.

The previous prime is 43864643. The next prime is 43864693. The reversal of 43864649 is 94646834.

It is an a-pointer prime, because the next prime (43864693) can be obtained adding 43864649 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31719424 + 12145225 = 5632^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 43864649 - 2⁸ = 43864393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43864643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21932324 + 21932325.

It is an arithmetic number, because the mean of its divisors is an integer number (21932325).

Almost surely, 2^43864649 is an apocalyptic number.

It is an amenable number.

43864649 is a deficient number, since it is larger than the sum of its proper divisors (1).

43864649 is an equidigital number, since it uses as much as digits as its factorization.

43864649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 44.

The square root of 43864649 is about 6623.0392570179. The cubic root of 43864649 is about 352.6724646059.

The spelling of 43864649 in words is "forty-three million, eight hundred sixty-four thousand, six hundred forty-nine".