421691669 has 16 divisors (see below), whose sum is σ = 494271360. Its totient is φ = 352235520.

The previous prime is 421691659. The next prime is 421691687. The reversal of 421691669 is 966196124.

It is not a de Polignac number, because 421691669 - 2⁴ = 421691653 is a prime.

It is a super-2 number, since 2×421691669² = 355647727408011122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421691629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155477 + ... + 158165.

It is an arithmetic number, because the mean of its divisors is an integer number (30891960).

Almost surely, 2^421691669 is an apocalyptic number.

It is an amenable number.

421691669 is a deficient number, since it is larger than the sum of its proper divisors (72579691).

421691669 is a wasteful number, since it uses less digits than its factorization.

421691669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260.

The product of its digits is 139968, while the sum is 44.

The square root of 421691669 is about 20535.1325537480. The cubic root of 421691669 is about 749.8913436666.

The spelling of 421691669 in words is "four hundred twenty-one million, six hundred ninety-one thousand, six hundred sixty-nine".