421949857 has 8 divisors (see below), whose sum is σ = 482604032. Its totient is φ = 361389600.

The previous prime is 421949851. The next prime is 421949861. The reversal of 421949857 is 758949124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421949857 - 2⁷ = 421949729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421949857.

It is not an unprimeable number, because it can be changed into a prime (421949851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13569 + ... + 32062.

It is an arithmetic number, because the mean of its divisors is an integer number (60325504).

Almost surely, 2^421949857 is an apocalyptic number.

It is an amenable number.

421949857 is a deficient number, since it is larger than the sum of its proper divisors (60654175).

421949857 is a wasteful number, since it uses less digits than its factorization.

421949857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46959.

The product of its digits is 725760, while the sum is 49.

The square root of 421949857 is about 20541.4180863932. The cubic root of 421949857 is about 750.0443570803.

The spelling of 421949857 in words is "four hundred twenty-one million, nine hundred forty-nine thousand, eight hundred fifty-seven".