673398921 has 12 divisors (see below), whose sum is σ = 972245328. Its totient is φ = 414399024.

The previous prime is 673398881. The next prime is 673398949. The reversal of 673398921 is 129893376.

It is not a de Polignac number, because 673398921 - 2¹⁷ = 673267849 is a prime.

It is a super-2 number, since 2×673398921² = 906932213607928482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (673398221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 663595 + ... + 664608.

It is an arithmetic number, because the mean of its divisors is an integer number (81020444).

Almost surely, 2^673398921 is an apocalyptic number.

It is an amenable number.

673398921 is a deficient number, since it is larger than the sum of its proper divisors (298846407).

673398921 is a wasteful number, since it uses less digits than its factorization.

673398921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328232 (or 1328219 counting only the distinct ones).

The product of its digits is 489888, while the sum is 48.

The square root of 673398921 is about 25949.9310403708. The cubic root of 673398921 is about 876.5112044557.

The spelling of 673398921 in words is "six hundred seventy-three million, three hundred ninety-eight thousand, nine hundred twenty-one".