670836921 has 4 divisors (see below), whose sum is σ = 894449232. Its totient is φ = 447224612.

The previous prime is 670836919. The next prime is 670836989. The reversal of 670836921 is 129638076.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 670836921 - 2¹ = 670836919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (670834921) 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, 111806151 + ... + 111806156.

It is an arithmetic number, because the mean of its divisors is an integer number (223612308).

Almost surely, 2^670836921 is an apocalyptic number.

It is an amenable number.

670836921 is a deficient number, since it is larger than the sum of its proper divisors (223612311).

670836921 is a wasteful number, since it uses less digits than its factorization.

670836921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223612310.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 670836921 is about 25900.5197052106. The cubic root of 670836921 is about 875.3982061260.

The spelling of 670836921 in words is "six hundred seventy million, eight hundred thirty-six thousand, nine hundred twenty-one".