421783690 has 16 divisors (see below), whose sum is σ = 763871328. Its totient is φ = 167677776.

The previous prime is 421783657. The next prime is 421783697. The reversal of 421783690 is 96387124.

It is a super-2 number, since 2×421783690² = 355802962300032200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421783697) 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, 127752 + ... + 131011.

It is an arithmetic number, because the mean of its divisors is an integer number (47741958).

Almost surely, 2^421783690 is an apocalyptic number.

421783690 is a deficient number, since it is larger than the sum of its proper divisors (342087638).

421783690 is a wasteful number, since it uses less digits than its factorization.

421783690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258933.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 421783690 is about 20537.3730063024. The cubic root of 421783690 is about 749.9458864661.

The spelling of 421783690 in words is "four hundred twenty-one million, seven hundred eighty-three thousand, six hundred ninety".