917390993 has 4 divisors (see below), whose sum is σ = 917509860. Its totient is φ = 917272128.

The previous prime is 917390951. The next prime is 917391011. The reversal of 917390993 is 399093719.

It is a happy number.

917390993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 780196624 + 137194369 = 27932^2 + 11713^2 .

It is a cyclic number.

It is not a de Polignac number, because 917390993 - 2²⁰ = 916342417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (917390933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46988 + ... + 63581.

It is an arithmetic number, because the mean of its divisors is an integer number (229377465).

Almost surely, 2^917390993 is an apocalyptic number.

It is an amenable number.

917390993 is a deficient number, since it is larger than the sum of its proper divisors (118867).

917390993 is a wasteful number, since it uses less digits than its factorization.

917390993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118866.

The product of its (nonzero) digits is 413343, while the sum is 50.

The square root of 917390993 is about 30288.4630346276. The cubic root of 917390993 is about 971.6685749460.

The spelling of 917390993 in words is "nine hundred seventeen million, three hundred ninety thousand, nine hundred ninety-three".