921138673 has 16 divisors (see below), whose sum is σ = 1140281856. Its totient is φ = 724587840.

The previous prime is 921138671. The next prime is 921138703. The reversal of 921138673 is 376831129.

It is a cyclic number.

It is not a de Polignac number, because 921138673 - 2¹ = 921138671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921138671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13513 + ... + 44998.

It is an arithmetic number, because the mean of its divisors is an integer number (71267616).

Almost surely, 2^921138673 is an apocalyptic number.

It is an amenable number.

921138673 is a deficient number, since it is larger than the sum of its proper divisors (219143183).

921138673 is a wasteful number, since it uses less digits than its factorization.

921138673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58704.

The product of its digits is 54432, while the sum is 40.

The square root of 921138673 is about 30350.2664403461. The cubic root of 921138673 is about 972.9899146440.

The spelling of 921138673 in words is "nine hundred twenty-one million, one hundred thirty-eight thousand, six hundred seventy-three".