421478399 has 8 divisors (see below), whose sum is σ = 451649520. Its totient is φ = 391904896.

The previous prime is 421478377. The next prime is 421478411. The reversal of 421478399 is 993874124.

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 421478399 - 2⁸ = 421478143 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 (421478339) 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, 147944 + ... + 150765.

It is an arithmetic number, because the mean of its divisors is an integer number (56456190).

Almost surely, 2^421478399 is an apocalyptic number.

421478399 is a deficient number, since it is larger than the sum of its proper divisors (30171121).

421478399 is a wasteful number, since it uses less digits than its factorization.

421478399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298809.

The product of its digits is 435456, while the sum is 47.

The square root of 421478399 is about 20529.9390890475. The cubic root of 421478399 is about 749.7649034991.

The spelling of 421478399 in words is "four hundred twenty-one million, four hundred seventy-eight thousand, three hundred ninety-nine".