916973639 has 4 divisors (see below), whose sum is σ = 917054160. Its totient is φ = 916893120.

The previous prime is 916973633. The next prime is 916973641. The reversal of 916973639 is 936379619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-916973639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916973633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19667 + ... + 47124.

It is an arithmetic number, because the mean of its divisors is an integer number (229263540).

Almost surely, 2^916973639 is an apocalyptic number.

916973639 is a deficient number, since it is larger than the sum of its proper divisors (80521).

916973639 is a wasteful number, since it uses less digits than its factorization.

916973639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80520.

The product of its digits is 1653372, while the sum is 53.

The square root of 916973639 is about 30281.5725978688. The cubic root of 916973639 is about 971.5212036573.

The spelling of 916973639 in words is "nine hundred sixteen million, nine hundred seventy-three thousand, six hundred thirty-nine".