421023393 has 32 divisors (see below), whose sum is σ = 721459200. Its totient is φ = 237677328.

The previous prime is 421023371. The next prime is 421023419. The reversal of 421023393 is 393320124.

It is a happy number.

421023393 is a `hidden beast` number, since 421 + 0 + 233 + 9 + 3 = 666.

It is not a de Polignac number, because 421023393 - 2⁶ = 421023329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421023313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2268 + ... + 29106.

It is an arithmetic number, because the mean of its divisors is an integer number (22545600).

Almost surely, 2^421023393 is an apocalyptic number.

It is an amenable number.

421023393 is a deficient number, since it is larger than the sum of its proper divisors (300435807).

421023393 is a wasteful number, since it uses less digits than its factorization.

421023393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26938 (or 26932 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 421023393 is about 20518.8545732943. The cubic root of 421023393 is about 749.4950040484.

The spelling of 421023393 in words is "four hundred twenty-one million, twenty-three thousand, three hundred ninety-three".