421916387 has 8 divisors (see below), whose sum is σ = 457124976. Its totient is φ = 387862272.

The previous prime is 421916381. The next prime is 421916423. The reversal of 421916387 is 783619124.

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 421916387 - 2¹⁸ = 421654243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421916381) 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 7 ways as a sum of consecutive naturals, for example, 287858 + ... + 289319.

It is an arithmetic number, because the mean of its divisors is an integer number (57140622).

Almost surely, 2^421916387 is an apocalyptic number.

421916387 is a deficient number, since it is larger than the sum of its proper divisors (35208589).

421916387 is a wasteful number, since it uses less digits than its factorization.

421916387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577237.

The product of its digits is 72576, while the sum is 41.

The square root of 421916387 is about 20540.6033747794. The cubic root of 421916387 is about 750.0245248277.

The spelling of 421916387 in words is "four hundred twenty-one million, nine hundred sixteen thousand, three hundred eighty-seven".