421440693 has 16 divisors (see below), whose sum is σ = 611058240. Its totient is φ = 257285376.

The previous prime is 421440647. The next prime is 421440703. The reversal of 421440693 is 396044124.

It is not a de Polignac number, because 421440693 - 2¹² = 421436597 is a prime.

It is a super-2 number, since 2×421440693² = 355224515432640498, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421441693) 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, 109783 + ... + 113556.

It is an arithmetic number, because the mean of its divisors is an integer number (38191140).

Almost surely, 2^421440693 is an apocalyptic number.

It is an amenable number.

421440693 is a deficient number, since it is larger than the sum of its proper divisors (189617547).

421440693 is a wasteful number, since it uses less digits than its factorization.

421440693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223396.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 421440693 is about 20529.0207511221. The cubic root of 421440693 is about 749.7425445212.

The spelling of 421440693 in words is "four hundred twenty-one million, four hundred forty thousand, six hundred ninety-three".