73430989 has 2 divisors, whose sum is σ = 73430990. Its totient is φ = 73430988.

The previous prime is 73430983. The next prime is 73430999. The reversal of 73430989 is 98903437.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 5368489 = 8250^2 + 2317^2 .

It is an emirp because it is prime and its reverse (98903437) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73430989 - 2⁵ = 73430957 is a prime.

It is a super-2 number, since 2×73430989² = 10784220291036242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73430983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36715494 + 36715495.

It is an arithmetic number, because the mean of its divisors is an integer number (36715495).

Almost surely, 2^73430989 is an apocalyptic number.

It is an amenable number.

73430989 is a deficient number, since it is larger than the sum of its proper divisors (1).

73430989 is an equidigital number, since it uses as much as digits as its factorization.

73430989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 73430989 is about 8569.1883512968. The cubic root of 73430989 is about 418.7547945096.

The spelling of 73430989 in words is "seventy-three million, four hundred thirty thousand, nine hundred eighty-nine".