421557587 has 6 divisors (see below), whose sum is σ = 463365084. Its totient is φ = 383234060.

The previous prime is 421557583. The next prime is 421557589. The reversal of 421557587 is 785755124.

It is not a de Polignac number, because 421557587 - 2² = 421557583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421557583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1741853 + ... + 1742094.

It is an arithmetic number, because the mean of its divisors is an integer number (77227514).

Almost surely, 2^421557587 is an apocalyptic number.

421557587 is a deficient number, since it is larger than the sum of its proper divisors (41807497).

421557587 is a wasteful number, since it uses less digits than its factorization.

421557587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483969 (or 3483958 counting only the distinct ones).

The product of its digits is 392000, while the sum is 44.

The square root of 421557587 is about 20531.8675964950. The cubic root of 421557587 is about 749.8118562139.

The spelling of 421557587 in words is "four hundred twenty-one million, five hundred fifty-seven thousand, five hundred eighty-seven".