421956890 has 16 divisors (see below), whose sum is σ = 762704640. Its totient is φ = 168075600.

The previous prime is 421956833. The next prime is 421956911. The reversal of 421956890 is 98659124.

It is a Curzon number.

It is an unprimeable number.

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, 85886 + ... + 90665.

It is an arithmetic number, because the mean of its divisors is an integer number (47669040).

Almost surely, 2^421956890 is an apocalyptic number.

421956890 is a deficient number, since it is larger than the sum of its proper divisors (340747750).

421956890 is a wasteful number, since it uses less digits than its factorization.

421956890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176797.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 421956890 is about 20541.5892763924. The cubic root of 421956890 is about 750.0485242679.

The spelling of 421956890 in words is "four hundred twenty-one million, nine hundred fifty-six thousand, eight hundred ninety".