43494989 has 2 divisors, whose sum is σ = 43494990. Its totient is φ = 43494988.

The previous prime is 43494967. The next prime is 43494991. The reversal of 43494989 is 98949434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42797764 + 697225 = 6542^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 43494989 - 2²⁰ = 42446413 is a prime.

It is a super-2 number, since 2×43494989² = 3783628136220242, which contains 22 as substring.

Together with 43494991, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43494289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21747494 + 21747495.

It is an arithmetic number, because the mean of its divisors is an integer number (21747495).

Almost surely, 2^43494989 is an apocalyptic number.

It is an amenable number.

43494989 is a deficient number, since it is larger than the sum of its proper divisors (1).

43494989 is an equidigital number, since it uses as much as digits as its factorization.

43494989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 50.

The square root of 43494989 is about 6595.0730852660. The cubic root of 43494989 is about 351.6789778290.

The spelling of 43494989 in words is "forty-three million, four hundred ninety-four thousand, nine hundred eighty-nine".