421903193 has 8 divisors (see below), whose sum is σ = 438529728. Its totient is φ = 405551664.

The previous prime is 421903171. The next prime is 421903291. The reversal of 421903193 is 391309124.

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

It is a cyclic number.

It is not a de Polignac number, because 421903193 - 2¹⁶ = 421837657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421903123) 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, 65621 + ... + 71762.

It is an arithmetic number, because the mean of its divisors is an integer number (54816216).

Almost surely, 2^421903193 is an apocalyptic number.

It is an amenable number.

421903193 is a deficient number, since it is larger than the sum of its proper divisors (16626535).

421903193 is a wasteful number, since it uses less digits than its factorization.

421903193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137503.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 421903193 is about 20540.2822035141. The cubic root of 421903193 is about 750.0167065908.

It can be divided in two parts, 4219031 and 93, that added together give a palindrome (4219124).

The spelling of 421903193 in words is "four hundred twenty-one million, nine hundred three thousand, one hundred ninety-three".