863673421 has 4 divisors (see below), whose sum is σ = 930109852. Its totient is φ = 797236992.

The previous prime is 863673409. The next prime is 863673427. The reversal of 863673421 is 124376368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 258759396 + 604914025 = 16086^2 + 24595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863673421 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 (863673427) 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, 33218196 + ... + 33218221.

It is an arithmetic number, because the mean of its divisors is an integer number (232527463).

Almost surely, 2^863673421 is an apocalyptic number.

It is an amenable number.

863673421 is a deficient number, since it is larger than the sum of its proper divisors (66436431).

863673421 is a wasteful number, since it uses less digits than its factorization.

863673421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66436430.

The product of its digits is 145152, while the sum is 40.

The square root of 863673421 is about 29388.3211667492. The cubic root of 863673421 is about 952.3206133154.

The spelling of 863673421 in words is "eight hundred sixty-three million, six hundred seventy-three thousand, four hundred twenty-one".