421166406 has 16 divisors (see below), whose sum is σ = 842554944. Its totient is φ = 140351784.

The previous prime is 421166401. The next prime is 421166411. The reversal of 421166406 is 604661124.

It is an interprime number because it is at equal distance from previous prime (421166401) and next prime (421166411).

It is a super-2 number, since 2×421166406² = 354762283085913672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421166401) 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, 25345 + ... + 38531.

It is an arithmetic number, because the mean of its divisors is an integer number (52659684).

Almost surely, 2^421166406 is an apocalyptic number.

421166406 is an abundant number, since it is smaller than the sum of its proper divisors (421388538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421166406 is a wasteful number, since it uses less digits than its factorization.

421166406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18515.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 421166406 is about 20522.3391941562. The cubic root of 421166406 is about 749.5798571283.

The spelling of 421166406 in words is "four hundred twenty-one million, one hundred sixty-six thousand, four hundred six".