420993431 has 4 divisors (see below), whose sum is σ = 443151000. Its totient is φ = 398835864.

The previous prime is 420993413. The next prime is 420993479. The reversal of 420993431 is 134399024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420993431 - 2⁶ = 420993367 is a prime.

It is a super-2 number, since 2×420993431² = 354470937890303522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420993391 and 420993400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420993401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11078756 + ... + 11078793.

It is an arithmetic number, because the mean of its divisors is an integer number (110787750).

Almost surely, 2^420993431 is an apocalyptic number.

420993431 is a deficient number, since it is larger than the sum of its proper divisors (22157569).

420993431 is a wasteful number, since it uses less digits than its factorization.

420993431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22157568.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 420993431 is about 20518.1244513235. The cubic root of 420993431 is about 749.4772244330.

The spelling of 420993431 in words is "four hundred twenty million, nine hundred ninety-three thousand, four hundred thirty-one".