43390993 has 2 divisors, whose sum is σ = 43390994. Its totient is φ = 43390992.

The previous prime is 43390969. The next prime is 43391017. The reversal of 43390993 is 39909334.

It is a balanced prime because it is at equal distance from previous prime (43390969) and next prime (43391017).

It can be written as a sum of positive squares in only one way, i.e., 43191184 + 199809 = 6572^2 + 447^2 .

It is a cyclic number.

It is not a de Polignac number, because 43390993 - 2⁹ = 43390481 is a prime.

It is not a weakly prime, because it can be changed into another prime (43390493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21695496 + 21695497.

It is an arithmetic number, because the mean of its divisors is an integer number (21695497).

Almost surely, 2^43390993 is an apocalyptic number.

It is an amenable number.

43390993 is a deficient number, since it is larger than the sum of its proper divisors (1).

43390993 is an equidigital number, since it uses as much as digits as its factorization.

43390993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 40.

The square root of 43390993 is about 6587.1839962157. The cubic root of 43390993 is about 351.3984673970.

The spelling of 43390993 in words is "forty-three million, three hundred ninety thousand, nine hundred ninety-three".