421859661 has 8 divisors (see below), whose sum is σ = 562872480. Its totient is φ = 281043312.

The previous prime is 421859651. The next prime is 421859699. The reversal of 421859661 is 166958124.

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

It is not a de Polignac number, because 421859661 - 2¹⁰ = 421858637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421859621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44031 + ... + 52748.

It is an arithmetic number, because the mean of its divisors is an integer number (70359060).

Almost surely, 2^421859661 is an apocalyptic number.

It is an amenable number.

421859661 is a deficient number, since it is larger than the sum of its proper divisors (141012819).

421859661 is a wasteful number, since it uses less digits than its factorization.

421859661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98235.

The product of its digits is 103680, while the sum is 42.

The square root of 421859661 is about 20539.2225023247. Note that the first 3 decimals coincide. The cubic root of 421859661 is about 749.9909101121.

The spelling of 421859661 in words is "four hundred twenty-one million, eight hundred fifty-nine thousand, six hundred sixty-one".