421744493 has 4 divisors (see below), whose sum is σ = 423184188. Its totient is φ = 420304800.

The previous prime is 421744447. The next prime is 421744571. The reversal of 421744493 is 394447124.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 196084009 + 225660484 = 14003^2 + 15022^2 .

It is a cyclic number.

It is not a de Polignac number, because 421744493 - 2⁸ = 421744237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421744403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719408 + ... + 719993.

It is an arithmetic number, because the mean of its divisors is an integer number (105796047).

Almost surely, 2^421744493 is an apocalyptic number.

It is an amenable number.

421744493 is a deficient number, since it is larger than the sum of its proper divisors (1439695).

421744493 is a wasteful number, since it uses less digits than its factorization.

421744493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439694.

The product of its digits is 96768, while the sum is 38.

The square root of 421744493 is about 20536.4186994714. The cubic root of 421744493 is about 749.9226545424.

The spelling of 421744493 in words is "four hundred twenty-one million, seven hundred forty-four thousand, four hundred ninety-three".