915438973 has 4 divisors (see below), whose sum is σ = 915528348. Its totient is φ = 915349600.

The previous prime is 915438929. The next prime is 915438977. The reversal of 915438973 is 379834519.

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, and also an emirpimes, since its reverse is a distinct semiprime: 379834519 = 17 ⋅22343207.

It can be written as a sum of positive squares in 2 ways, for example, as 750650404 + 164788569 = 27398^2 + 12837^2 .

It is a cyclic number.

It is not a de Polignac number, because 915438973 - 2²⁵ = 881884541 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 (915438977) 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, 26986 + ... + 50587.

It is an arithmetic number, because the mean of its divisors is an integer number (228882087).

Almost surely, 2^915438973 is an apocalyptic number.

It is an amenable number.

915438973 is a deficient number, since it is larger than the sum of its proper divisors (89375).

915438973 is a wasteful number, since it uses less digits than its factorization.

915438973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89374.

The product of its digits is 816480, while the sum is 49.

The square root of 915438973 is about 30256.2220543147. Note that the first 3 decimals coincide. The cubic root of 915438973 is about 970.9789150397.

The spelling of 915438973 in words is "nine hundred fifteen million, four hundred thirty-eight thousand, nine hundred seventy-three".